Battery pack and device including same

Abstract

A battery pack according to an embodiment of the present invention comprises: a battery module comprising a battery cell stack in which a plurality of battery cells including electrode leads are stacked, and a module frame in which the battery cell stack is accommodated; a pack frame in which the module frame having the battery cell stack accommodated therein is accommodated, and which has an open upper portion; a pack cover which covers the open upper portion of the pack frame; and a cross member which sets the position of the module frame having the battery cell stack accommodated therein. At least one flange which is coupled to the cross member is provided on the side surface of the module frame.

Description

Battery pack and device including same

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0068575, filed May 27, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery pack and a device including the same, and more particularly, to a battery pack with improved space utilization and a device including the same.

[0004] In modern society, the widespread use of portable devices like cell phones, laptops, camcorders, and digital cameras has fueled active development of technologies related to these devices. Furthermore, rechargeable secondary batteries are increasingly being used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) to address air pollution caused by conventional gasoline-powered vehicles, further fueling the growing need for secondary battery development.

[0005] Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based secondary batteries.

[0006] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. The lithium secondary battery comprises an electrode assembly comprising a positive electrode plate and a negative electrode plate, each coated with the positive and negative electrode active materials, with a separator interposed between them, and a battery case that seals and houses the electrode assembly together with an electrolyte.

[0007] In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0008] Secondary batteries used in small devices are configured with 2-3 battery cells, but secondary batteries used in medium- to large-sized devices such as automobiles utilize battery modules in which multiple battery cells are electrically connected. These battery modules enhance capacity and output by forming a battery cell stack by connecting multiple battery cells in series or parallel. In addition, one or more battery modules may be mounted together with various control and protection systems, such as a Battery Disconnect Unit (BDU), a Battery Management System (BMS), and a cooling system, to form a battery pack.

[0009] Fig. 1 is a perspective view showing a conventional battery pack (10). Fig. 2 is an exploded perspective view of a conventional battery module (1) and battery pack (10). Fig. 3 is a partial perspective view showing a conventional battery module (1) and battery pack (10). Fig. 4 is a plan view of a conventional battery module (1) and battery pack (10).

[0010] A conventional battery pack (10) may include a cross beam (11) that sets the position of the battery module (1). The cross beam (11) can prevent the battery module (1) mounted on the battery pack (10) from being detached.

[0011] However, the space utilization of the battery pack (10) is reduced due to the space occupied by the cross beam (11) inside the battery pack (10). This causes a decrease in the energy density of the battery pack (10). In addition, the introduction of the cross beam (11) increases the mass of the battery pack (10).

[0012] The problem to be solved by the present invention is to increase the space utilization rate of a battery pack and reduce the mass and unit cost, and specifically, to provide a battery pack and a device including the same that can increase the space utilization rate of a battery pack and reduce the mass and unit cost by introducing a cross member that replaces an existing cross beam.

[0013] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0014] According to one embodiment of the present invention, a battery pack includes a battery module including a battery cell stack in which a plurality of battery cells including electrode leads are stacked and a module frame in which the battery cell stack is accommodated; a pack frame in which the module frame in which the battery cell stack is accommodated is accommodated and has an open upper portion; a pack cover covering the open upper portion of the pack frame; and a cross member that sets a position of the module frame in which the battery cell stack is accommodated. At least one flange coupled to the cross member is provided on a side surface of the module frame.

[0015] The above flange may include a fastening hole for engaging with the cross member.

[0016] The above cross member may be a belt-shaped member.

[0017] The above cross member may include a joint that is coupled to the flange.

[0018] The above cross member and the above flange can be hook-joined.

[0019] The above cross member may be parallel to the direction in which the electrode lead protrudes.

[0020] The pack frame may include a bottom frame on which the module frame in which the battery cell stack is housed is placed; and a side frame arranged along the perimeter of the bottom frame. The cross member may have a mounting portion coupled to the upper end of the side frame.

[0021] The above-mentioned mounting portion can be bolt-connected to the pack frame.

[0022] The above cross member can be combined with the above pack cover.

[0023] The above cross member may include a screw coupled to the pack cover.

[0024] According to another embodiment of the present invention, a device including the battery pack is provided.

[0025] According to embodiments of the present invention, the space utilization of a battery pack can be increased by introducing a cross member that replaces a conventional cross beam and a module frame that is coupled to the cross member. This can reduce the mass and unit cost of the battery pack.

[0026] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0027] Figure 1 is a perspective view showing a conventional battery pack.

[0028] Figure 2 is an exploded perspective view of a conventional battery module and battery pack.

[0029] Figure 3 is a partial perspective view showing a conventional battery module and battery pack.

[0030] Figure 4 is a plan view of a conventional battery module and battery pack.

[0031] FIG. 5 is a partial perspective view showing a battery pack according to one embodiment of the present invention.

[0032] Figure 6 is an exploded perspective view showing a battery module according to one embodiment of the present invention.

[0033] FIG. 7 is a partially exploded perspective view of a battery module and battery pack according to one embodiment of the present invention.

[0034] Figure 8 is a partial perspective view of a battery pack according to one embodiment of the present invention.

[0035] Figure 9 is an exploded perspective view of a battery pack according to one embodiment of the present invention.

[0036] Figure 10 is a perspective view showing a module frame according to one embodiment of the present invention.

[0037] Fig. 11 is a perspective view showing a cross member according to one embodiment of the present invention.

[0038] Figure 12 is a partial drawing showing an enlarged portion of “A” of Figure 11.

[0039] FIG. 13 is a partial perspective view showing a cross member and a module frame according to one embodiment of the present invention.

[0040] Figure 14 is an exploded perspective view showing a side frame and cross member according to one embodiment of the present invention.

[0041] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0042] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0043] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0044] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, we mean that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the reference part in the opposite direction of gravity.

[0045] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0046] Additionally, throughout the specification, when we say "planar", we mean when the target portion is viewed from above, and when we say "cross-sectional top", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0047] FIG. 5 is a partial perspective view showing a battery pack (1000) according to one embodiment of the present invention. Specifically, FIG. 5 shows a battery pack (1000) with a battery module (100) and a pack cover (1400) removed. FIG. 6 is an exploded perspective view showing a battery module (100) according to one embodiment of the present invention. FIG. 7 is a partial exploded perspective view showing a battery module (100) and a battery pack (1000) according to one embodiment of the present invention. FIG. 8 is a partial perspective view showing a battery pack (1000) according to one embodiment of the present invention. Specifically, FIG. 8 shows a battery pack (1000) with a pack cover (1400) removed. FIG. 9 is an exploded perspective view showing a battery pack (1000) according to one embodiment of the present invention. FIG. 9 shows a battery pack (1000) including a pack cover (1400).

[0048] Referring to FIGS. 5 to 9, a battery pack (1000) according to one embodiment of the present invention includes a battery module (100) including a battery cell stack (120) in which a plurality of battery cells (110) including electrode leads (111) are stacked and a module frame (130) in which the battery cell stack (120) is accommodated; a pack frame (1200) in which the module frame (130) in which the battery cell stack (120) is accommodated is accommodated and has an open upper portion; a pack cover (1400) covering the open upper portion of the pack frame (1200); and a cross member (1100) for setting the position of the module frame (130) in which the battery cell stack (120) is accommodated.

[0049] The battery module (100) according to the present embodiment includes a plurality of battery cells (110). The battery cell (110) according to the present embodiment may be a battery cell of various shapes, for example, a pouch-shaped battery cell, a square battery cell, or a cylindrical battery cell. For example, as illustrated in FIG. 6, the battery cell according to the present embodiment may be a pouch-shaped battery cell (110). Hereinafter, the pouch-shaped battery cell (110) will be described, but the battery cell according to the present embodiment is not limited thereto, and various types of battery cells may be applied.

[0050] The battery modules (100) may be configured with a plurality of battery cells (110). For example, the plurality of battery cells (110) may be stacked along one direction so as to be electrically connected to each other to form a battery cell stack (120). For example, the plurality of battery cells (110) may be stacked in an upright manner along a direction parallel to the x-axis of FIG. 6. The battery cells (110) may be stacked from one side of the module frame (130) to the other side in a state where one side of the battery cells (110) is parallel to the side surfaces of the module frame (130). Accordingly, the electrode leads (111) may protrude in a direction perpendicular to the direction in which the battery cells (110) are stacked. In the battery cells (110), one electrode lead (111) may protrude toward the +y-axis direction of FIG. 6, and the other electrode lead (111) may protrude toward the -y-axis direction of FIG. 6. If the battery cell (110) has electrode leads (111) protruding in only one direction, the electrode leads (111) may protrude in the y-axis direction or the -y-axis direction of FIG. 6.

[0051] The module frame (130) according to the present embodiment may be intended to protect the battery cell stack (120) and electrical components connected thereto from external physical impact. The module frame (130) may accommodate the battery cell stack (120) and electrical components connected thereto in the internal space of the module frame (130).

[0052] The structure of the module frame (130) may vary. According to the present embodiment, the structure of the module frame (130) may be a monoframe structure. Here, the monoframe may be in the form of a metal plate with an upper surface, a lower surface, and both side surfaces integrated. The monoframe may be manufactured by extrusion molding.

[0053] However, the structure of the module frame (130) is not limited thereto, and as another example, the module frame (130) may have a structure in which a U-shaped frame and an upper plate are combined. In this case, the U-shaped frame may be formed by combining or integrating the lower surface and both side surfaces of the module frame (130). At this time, each frame or plate constituting the U-shaped frame may be manufactured by press forming. In addition, the structure of the module frame (130) may be provided as an L-shaped frame structure in addition to a mono-frame or a U-shaped frame, and may also be provided as various structures not described in the above-described examples.

[0054] The module frame (130) may be provided in a form in which the front and back sides are open along the longitudinal direction (y-axis direction of FIG. 6). Here, the longitudinal direction may be the direction in which the electrode leads (111) protrude from the battery cells (110). In addition, the longitudinal direction may be a direction perpendicular to the width direction of the battery cell stack (120) described above. That is, the longitudinal direction may be a direction parallel to the y-axis of FIG. 6, and the width direction may be a direction parallel to the x-axis of FIG. 6.

[0055] The pack frame (1200) according to the present embodiment may be intended to protect the battery module (100) and electrical components connected thereto from external physical impact. As will be described later, the pack frame (1200) may include a bottom frame (1200b) on which a module frame (130) in which a battery cell stack (120) is housed is placed, and a side frame (1200a) arranged along the perimeter of the bottom frame (1200b). After the battery modules (100) are arranged in the internal space of the bottom frame (1200b), the pack frame (1200) may be sealed by combining the pack cover (1400) with the corner of the side frame (1200a).

[0056] The pack frame (1200) may include a portion with high thermal conductivity to quickly release heat generated in the internal space to the outside. For example, at least a portion of the pack frame (1200) may be manufactured from a metal with high thermal conductivity, such as aluminum, gold, silver, copper, platinum, or an alloy containing these. In addition, the pack frame (1200) may be partially electrically insulating, and an insulating film may be provided or an insulating paint may be applied to a location where insulation is required. The portion of the pack frame (1200) to which the insulating film or insulating paint is applied may be referred to as an insulating portion.

[0057] The battery module (100) may be mounted at a position set by the cross member (1100) according to the present embodiment. For example, as illustrated in FIG. 8, the battery modules (100) may be arranged in two rows inside the pack frame (1200), and the cross member (1100) may be arranged across the central portion of the pack frame (1200) to space the battery modules (100) arranged in two rows apart. One side of the module frame (130) may be positioned corresponding to one side of the cross member (1100), and the opposite side of the module frame (130) may be positioned opposite the side of the cross member (1100). However, this is merely an example of the internal structure of the battery pack (1000), and the structure of the battery pack (1000) of the present embodiment is not limited to the above-described example.

[0058] As will be described later, the battery module (100) can be prevented from being separated from the battery pack (1000) through the connection between the cross member (1100) and the module frame (130). By minimizing the movement of the battery module (100) in the forward, backward, left, and right directions (+x-axis, -x-axis, +y-axis, and -y-axis directions of FIG. 8) through the connection between the cross member (1100) and the module frame (130), damage to the battery module (100) due to external vibration and impact can be prevented.

[0059] As illustrated in FIGS. 1 to 4, the existing cross beam (11, see FIG. 3) occupies the space between the battery modules (1). By applying the cross member (1100) according to the present embodiment instead of the existing cross beam (11, see FIG. 3), the space between the battery modules (100) can be minimized. Specifically, in order to couple the existing cross beam (11, see FIG. 3) and the battery module (1), the existing cross beam is required to have a width greater than a certain level along the direction in which the battery cells are stacked (the x-axis direction in FIG. 4). However, as will be described later, the cross member (1100) according to the present embodiment may be sufficient to have a width smaller than the width required for the existing cross beam (1) in connection with the battery module (100). In addition, as shown in FIGS. 5, 7, and 8, in the battery pack (1000) to which the cross member (1100) according to the present embodiment is applied, unlike the battery pack (10) to which the existing cross beam (11, see FIG. 3) is applied, a space is created between the cross member (1100) and the bottom frame (1200b), so that the space utilization rate can be increased compared to the existing battery pack (10, FIG. 3).

[0060] For example, by adding a battery cell (110) to the space occupied by an existing cross beam (11, see FIG. 3), the energy density can be increased. As another example, by adding a cooling member to the space occupied by an existing cross beam (11, see FIG. 3), the cooling performance can be increased. As yet another example, by adding an insulating pad to the space occupied by an existing cross beam (11, see FIG. 3), the swelling phenomenon of the battery module (100) can be controlled.

[0061] Fig. 10 is a perspective view showing a module frame (130) according to one embodiment of the present invention.

[0062] Referring to FIG. 10, a side surface of a module frame (130) according to one embodiment of the present invention is provided with at least one flange (131) that is coupled to a cross member (1100).

[0063] The flange (131) may protrude and extend in a direction perpendicular to the direction in which the cross member (1100) extends (the x-axis direction in FIG. 10). That is, the flange (131) may protrude outward (in the +x-axis direction or the -x-axis direction in FIG. 10) from one side of the module frame (130). Specifically, some flanges (131) may protrude in the +x-axis direction from one side located in the +x-axis direction of the module frame (130), and other flanges (131) may protrude in the -x-axis direction from another side located in the -x-axis direction of the module frame (130). There may be a plurality of flanges (131), and the number may be determined by the coupling force between the flanges (131) and the cross member (1100), etc.

[0064] By providing a flange (131) on the side of the module frame (130) and connecting the battery module (100) and the cross member (1100) through the flange (131), the space utilization inside the battery pack (1000) can be increased.

[0065] Continuing with reference to FIG. 10, a flange (131) according to one embodiment of the present invention may include a fastening hole (131a) that is coupled with a cross member (1100).

[0066] The battery module (100) can be prevented from being detached by the coupling between the flange (131) and the cross member (1100). In other words, the movement of the battery module (100) in the forward, backward, left, and right directions (+x-axis, -x-axis, +y-axis, and -y-axis directions of FIG. 8) is minimized by the coupling between the flange (131) and the cross member (1100), thereby preventing damage to the battery module (100) due to external vibration and impact.

[0067] The connection between the flange (131) and the cross member (1100) may be a hook connection, which will be described later, or may be a forced fit connection, a bolt connection, or a rivet connection in addition to the hook connection. The method of connection between the flange (131) and the cross member (1100) may be determined by the rigidity of the battery pack (1000) required in situations such as external vibration or impact.

[0068] In Fig. 10, the flange (131) is illustrated as including two fastening holes (131a) each, but the shape, size, and number of the fastening holes (131a) may be determined depending on the method of joining the flange (131) and the cross member (1100).

[0069] FIG. 11 is a perspective view showing a cross member (1100) according to one embodiment of the present invention.

[0070] Referring to FIG. 11, a cross member (1100) according to one embodiment of the present invention may be a belt-shaped member.

[0071] The cross member (1100) may be formed as a straight belt-shaped member or a curved belt-shaped member. The thickness, material, length, and width of the cross member (1100) may be designed based on the dimensions of the battery pack (1000) and the battery module (100), the required rigidity, etc.

[0072] Since the cross member (1100) is formed as a belt-shaped member, the mass of the battery pack (1000) can be reduced compared to a battery pack (1000) to which a conventional cross beam (11, see FIG. 3) is applied. In addition, the unit price of the battery pack (1000) can be reduced.

[0073] Fig. 12 is a partial drawing showing an enlarged portion of “A” of Fig. 11. Fig. 13 is a partial perspective view showing a cross member (1100) and a module frame (130) according to one embodiment of the present invention. Specifically, Fig. 13 is a partial perspective view showing a coupling relationship between the cross member (1100) and the module frame (130).

[0074] Referring to FIGS. 11 to 13, a cross member (1100) according to one embodiment of the present invention may include a coupling portion (1100a) coupled with a flange (131).

[0075] Although the connecting portion (1100a) in FIG. 11 is illustrated as having a shape protruding in the +z-axis direction of FIG. 11, the shape of the connecting portion (1100a) may be determined by the method of connecting the cross member (1100) and the flange (131). The connection between the flange (131) and the cross member (1100) may be a hook connection, which will be described later, or may be a force-fit connection, a bolt connection, or a rivet connection as described above. If the hook connection method is adopted, the connecting portion (1100a) may have a hook shape. If the force-fit connection method is adopted, the connecting portion (1100a) may have a shape suitable for force-fit connection with the fastening hole (131a) of the flange (131). For example, the connecting portion (1100a) may have a protruding shape that is force-fit connected with the fastening hole (131a). If a bolt connection method is adopted, the connection part (1100a) may be a hole through which a bolt passes. For example, the flange (131) and the cross member (1100) may be connected in such a way that the bolt passes through the hole and the fastening hole (131a) and is fastened with a nut. The connection method between the flange (131) and the cross member (1100) may be determined by the rigidity of the battery pack (1000) required due to external vibration or impact, etc.

[0076] The cross member (1100) and the flange (131) can be hook-coupled. Although not shown, the connecting portion (1100a) of the cross member (1100) can have a hook structure, and the hook structure can be detachably coupled to the flange (131). By the hook structure, the cross member (1100) can be fixed to the correct position of the flange (131), and can be easily assembled and disassembled in a one-touch manner.

[0077] Referring again to FIGS. 6 to 8, the cross member (1100) according to one embodiment of the present invention may be parallel to the direction in which the electrode lead (111) protrudes.

[0078] As described above, the battery cells (110) are stacked along one direction within the battery module (100), and the cross member (1100) may be positioned on one side of the stacking direction of the battery cells (110) with respect to the battery module (100). The cross member (1100) may be formed to extend along a direction perpendicular to the stacking direction of the battery cells (110). More specifically, as illustrated in FIGS. 7 and 8, the battery cells (110) may be stacked along a direction parallel to the x-axis of FIG. 6, perpendicular to one side of the bottom frame (1200b) of the pack frame (1200) within the battery module (100). The cross member (1100) is positioned on one side of one battery module (100) in the x-axis direction of FIG. 8. In addition, the cross member (1100) may be formed to extend along a direction parallel to the y-axis of FIG. 8.

[0079] By arranging the cross member (1100) parallel to the direction in which the electrode lead (111) protrudes (the y-axis direction in FIG. 6), the bonding force between the flange (131) and the cross member (1100) can be maximized. This can prevent the battery module (100) from being detached. By minimizing the forward, backward, left, and right (+x-axis, -x-axis, +y-axis, and -y-axis directions in FIG. 8) of the battery module (100) due to the bonding between the flange (131) and the cross member (1100), damage to the battery module (100) due to external vibration and impact can be prevented.

[0080] In addition, by arranging the cross member (1100) parallel to the direction in which the electrode lead (111) protrudes (y-axis direction in FIG. 6), the space utilization rate inside the battery pack (1000) can be increased and the energy density can be increased.

[0081] Fig. 14 is an exploded perspective view showing a side frame (1200a) and a cross member (1100) according to one embodiment of the present invention. Specifically, Fig. 14 is an exploded perspective view showing the coupling relationship between the side frame (1200a) and the cross member (1100).

[0082] Referring to FIGS. 7, 8, 11, and 14, a pack frame (1200) according to one embodiment of the present invention may include a bottom frame (1200b) on which a module frame (130) having a battery cell stack (120) housed therein is placed; and a side frame (1200a) arranged along the perimeter of the bottom frame (1200b). The cross member (1100) may be provided with a mounting portion (1100c) coupled to the upper end of the side frame (1200a).

[0083] The side frame (1200a) can extend in a direction perpendicular to one side of the bottom frame (1200b). An internal space with an open upper portion is provided by the bottom frame (1200b) and the side frame (1200a), and at least one battery module (100) can be stored in this internal space.

[0084] As will be described later, the mechanical rigidity of the battery pack (1000) can be secured in situations such as external vibration or impact of the battery pack (1000) through the connection between the mounting portion (1100c) and the pack frame (1200).

[0085] Referring again to FIG. 14, the mounting portion (1100c) according to one embodiment of the present invention can be bolt-connected to the pack frame (1200).

[0086] The mounting portion (1100c) may include a through hole (1100ca) penetrating in the z-axis direction of FIG. 14. In addition, the pack frame (1200) may include a pack frame fastening hole (1200aa) at a position corresponding to the through hole (1100ca). When the through hole (1100ca) and the pack frame fastening hole (1200aa) are aligned, the cross member (1100) may be fixed to the pack frame (1200) by fastening a bolt (1300) penetrating them. For example, a screw thread may be formed on the inner wall of the pack frame fastening hole (1200aa), and the bolt (1300) may be directly coupled to the pack frame fastening hole (1200aa).

[0087] Through the connection between the cross member (1100) and the pack frame (1200), the mechanical rigidity of the battery pack (1000) can be secured in situations such as external vibration or impact of the battery pack (1000). In addition, since the movement of the battery module (100) in the forward, backward, left, and right directions (+x-axis, -x-axis, +y-axis, and -y-axis directions of FIG. 8) is minimized, damage to the battery module (100) due to external vibration and impact can be prevented.

[0088] Referring again to FIG. 9, a cross member (1100) according to one embodiment of the present invention may be coupled with a pack cover (1400). For example, the cross member (1100) may include a protruding shape (not shown) that is coupled with the pack cover, and the pack cover (1400) may include an insertion portion (not shown) into which the protruding shape may be inserted at a position corresponding to the protruding shape. By inserting the protruding shape into the insertion portion, the cross member (1100) may be coupled with the pack cover (1400).

[0089] In addition, as another example, a separate nut member (not shown) may be provided on the cross member (1100). The pack cover (1400) may include a hole (not shown) in the pack cover (1400) at a position corresponding to the nut member. By fastening a bolt (not shown) passing through the nut member and the hole of the pack cover (1400) while they are aligned, the cross member (1100) may be coupled to the pack cover (1400).

[0090] Through the connection between the cross member (1100) and the pack cover (1400), the mechanical rigidity of the battery pack (1000) can be secured in situations such as external vibration or impact of the battery pack (1000). In addition, since the movement of the battery module (100) in the forward, backward, left, and right directions (+x-axis, -x-axis, +y-axis, and -y-axis directions of FIG. 8) is minimized, damage to the battery module (100) due to external vibration and impact can be prevented.

[0091] Referring again to FIGS. 9 and 12, another embodiment of the present invention may include a cross member (1100) that is coupled to a pack cover (1400). The screw (1100b) may protrude in the +z-axis direction of FIG. 9, i.e., toward the pack cover (1400), as illustrated in FIG. 9. The pack cover (1400) may include a hole (not illustrated) at a position corresponding to the screw (1100b). After the screw (1100b) passes through the hole, a nut may be fastened to the screw (1100b), thereby coupling the cross member (1100) and the pack cover (1400). For effective fixation, it is preferable that a plurality of screws (1100b) be applied to each cross member (1100).

[0092] Through this combination, the mechanical rigidity of the battery pack (1000) can be secured in situations such as external vibration or impact of the battery pack (1000). In addition, by minimizing the movement of the battery module (100) in the forward, backward, left, and right directions (+x-axis, -x-axis, +y-axis, and -y-axis directions of FIG. 8), damage to the battery module (100) due to external vibration and impact can be prevented.

[0093] According to another embodiment of the present invention, a device including a battery pack (1000) is provided. The battery pack (1000) can be applied to various devices. Specifically, it can be applied to transportation vehicles such as electric bicycles, electric vehicles, and hybrid vehicles, or ESS (Energy Storage Systems), but is not limited thereto, and can be applied to various devices capable of using secondary batteries.

[0094] In this example, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0095] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0096] Description of the symbol

[0097] 100: Battery module

[0098] 110: Battery cell

[0099] 111: Electrode lead

[0100] 120: Battery cell stack

[0101] 130: Module Frame

[0102] 131: Flange

[0103] 1000: Battery pack

[0104] 1100: Cross absence

[0105] 1100a: Joint

[0106] 1100b: Screw

[0107] 1100c: Settling part

[0108] 1200: Pack Frame

[0109] 1200a: Side frame

[0110] 1200b: Floor frame

[0111] 1300: Volt

[0112] 1400: Pack Cover

Claims

1. A battery module including a battery cell stack in which a plurality of battery cells including electrode leads are stacked and a module frame in which the battery cell stack is accommodated; A pack frame in which the module frame in which the battery cell stack is housed is housed and the upper part is open; A pack cover covering the open upper portion of the pack frame; and A cross member for setting the position of the module frame in which the battery cell stack is stored; A battery pack having at least one flange coupled to the cross member on a side of the module frame.

2. In paragraph 1, A battery pack wherein the flange includes a fastening hole for joining with the cross member.

3. In paragraph 1, The above cross member is a battery pack that is a belt-shaped member.

4. In paragraph 1, A battery pack wherein the cross member includes a joint that is joined to the flange.

5. In paragraph 1, A battery pack in which the above cross member and the above flange are hook-joined.

6. In paragraph 1, The above cross member is a battery pack parallel to the direction in which the electrode leads protrude.

7. In paragraph 1, The pack frame includes a bottom frame on which the module frame in which the battery cell stack is stored is placed; and a side frame arranged along the perimeter of the bottom frame; A battery pack having a mounting portion that is connected to the upper portion of the side frame, wherein the cross member is above.

8. In paragraph 7, The above-mentioned mounting part is a battery pack that is bolt-connected to the pack frame.

9. In paragraph 1, The above cross member is a battery pack that is combined with the above pack cover.

10. In paragraph 1, A battery pack wherein the cross member includes a screw coupled to the pack cover.

11. A device including a battery pack according to paragraph 1.

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