Battery packs and devices containing them

Abstract

The present invention includes a battery pack and a device including the same. A battery pack according to one embodiment of the present invention includes a lower pack frame on which a plurality of battery modules are mounted; an upper pack frame located above the plurality of battery modules; and a rigid beam included in the lower pack frame, wherein the rigid beam is formed of a reinforcing member including a viscous damper or a viscoelastic damper.

Description

[Technical Field]

[0001] [Cross-reference to related applications] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0124084 dated September 16, 2021, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a battery pack and a device including the same, and more particularly to a battery pack and a device including the same that have reinforced rigidity and can flexibly respond to external vibrations and shocks. [Background technology]

[0003] Secondary batteries, which are easily applicable to various products and have electrical properties such as high energy density, are widely used not only in portable devices but also in electric vehicles or hybrid vehicles powered by electrical sources, power storage devices, etc. These secondary batteries are attracting attention as a new energy source that is environmentally friendly and improves energy efficiency because they do not produce any by-products due to energy use, in addition to their primary advantage of dramatically reducing the use of fossil fuels.

[0004] Currently commercially available secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Of these, lithium secondary batteries are attracting attention due to their advantages over nickel-based secondary batteries, such as almost no memory effect, freedom in charging and discharging, a very low self-discharge rate, and high energy density.

[0005] Generally, lithium secondary batteries can be classified into cylindrical or prismatic secondary batteries, in which an electrode assembly is housed in a metal can, and pouch-type secondary batteries, in which an electrode assembly is housed in an aluminum laminate sheet pouch, depending on the shape of the exterior material.

[0006] Recently, as secondary batteries are increasingly used as energy storage sources, the need for large-capacity secondary battery structures has increased, leading to an increased demand for battery packs with medium- to large-sized modular structures that assemble battery modules in which multiple secondary batteries are connected in series or parallel. Such battery modules improve capacity and output by connecting multiple battery cells in series or parallel to form a battery cell stack. Furthermore, multiple battery modules can be mounted together with various control and protection systems, such as a battery management system (BMS) and a cooling system, to form a battery pack.

[0007] However, because a battery pack is made up of a large number of battery modules assembled together, it can be heavy, which poses a problem in that it is not suitable for loading a large number of batteries onto a vehicle such as an automobile.

[0008] FIG. 1 is a diagram showing a battery pack frame of a conventional battery pack.

[0009] A typical battery pack frame 10 may include a side frame 150 formed by extending along the periphery of the lower pack frame, and at least two or more internal beams 110 that contact the inner surfaces of the side frame 150 and define the interior of the lower pack frame.

[0010] The battery pack frame 10 may be made of a metal material, but in this case, there is a limit to how much vibration or shock can be absorbed from the outside, and the durability and stability of the battery pack may be reduced.

[0011] Increasing the thickness of the battery pack frame 10 to overcome this problem can improve durability and stability, but it can also increase the volume and weight of the batteries themselves. Therefore, compared to a typical battery pack 10, fewer batteries can be installed in a device such as an automobile, and it may not be possible to provide the energy required to drive the device.

[0012] Therefore, in order to overcome the above-mentioned problems, it is necessary to apply a battery pack structure that can absorb external vibrations and shocks to increase the durability and stability of the battery pack while preventing a decrease in the energy density of the battery. Summary of the Invention [Problem to be solved by the invention]

[0013] The problem to be solved by the present invention is to provide a battery pack and a device including the same that can absorb external vibrations and shocks to improve durability and reinforce rigidity.

[0014] However, the problems to be solved by the embodiments of the present invention are not limited to the above problems, and can be variously expanded within the scope of the technical ideas included in the present invention. [Means for solving the problem]

[0015] A battery pack according to one embodiment of the present invention includes a lower pack frame on which a plurality of battery modules are mounted; an upper pack frame located above the plurality of battery modules; and a rigid beam included in the lower pack frame, wherein the rigid beam may be formed of a reinforcing member including a viscous damper or a viscoelastic damper.

[0016] Two or more reinforcing members may be formed inside the rigid beam.

[0017] The lower pack frame may include a bottom on which the plurality of battery modules are mounted, side frames extending along each edge of a bottom surface of the lower pack frame, and an inner beam defining an interior of the lower pack frame.

[0018] The rigid beam may be included in the inner beam.

[0019] The housing may further include a reinforcing beam positioned adjacent to the inner beam.

[0020] The rigid beam may be included in the side frame.

[0021] The side frame may further include a reinforcing beam positioned in contact with one surface of the side frame.

[0022] One surface of the rigid beam may be in contact with the bottom, and the other surface of the rigid beam may be in contact with the side frame.

[0023] The lower pack frame includes a bottom on which the plurality of battery modules are mounted, side frames extending along each edge of the bottom surface of the lower pack frame, and an internal beam that defines the interior of the lower pack frame, and the rigid beam may be welded to at least one of the side frames and the internal beam.

[0024] In a battery pack according to another embodiment of the present invention, the rigid beam may be formed as a hollow structure.

[0025] The reinforcing member may be positioned inside the rigid beam, and fastening portions at both ends of the reinforcing member may be positioned in contact with the inner surface of the rigid beam.

[0026] The reinforcing member may be positioned vertically relative to the bottom of the lower pack frame.

[0027] The reinforcing member may be positioned horizontally based on the bottom of the lower pack frame. [Effects of the Invention]

[0028] According to the embodiment, by applying a battery pack frame structure including a reinforcing member, it is possible to absorb shocks and vibrations applied to the battery from the outside, thereby improving the durability and rigidity of the battery pack.

[0029] Furthermore, since the thickness of the battery pack frame itself does not increase, the energy density per weight and volume of the battery does not decrease, and the efficiency of the battery can be maintained.

[0030] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a diagram showing a battery pack frame of a conventional battery pack. [Figure 2] 1 is a perspective view of a battery pack according to an embodiment of the present invention; [Figure 3] FIG. 3 is an exploded perspective view of the battery pack of FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along the line AA' in FIG. [Figure 5] 5 is a view showing the reinforcing member of FIG. 4. [Figure 6] FIG. 4 is a cross-sectional view taken along the line AA' in FIG. [Figure 7] 7 is a view showing the reinforcing member of FIG. 6. [Figure 8] 7 is a cross-sectional view showing a process in which the reinforcing member of FIG. 6 absorbs an externally generated impact. [Figure 9] 10 is a view showing a configuration in which a rigid beam is positioned in a battery pack frame; [Figure 10] 10 is a view showing a configuration in which a rigid beam is positioned in a battery pack frame; [Figure 11] 10 is a view showing a configuration in which a rigid beam is positioned in a battery pack frame; [Figure 12] 10 is a view showing a configuration in which a rigid beam is positioned in a battery pack frame; [Figure 13] 10 is a view showing a configuration in which a rigid beam is positioned in a battery pack frame; [Figure 14] 10 is a cross-sectional view of a battery pack frame including a reinforcing member in a battery pack according to another embodiment of the present invention. [Figure 15]10 is a cross-sectional view of a battery pack frame including a reinforcing member in a battery pack according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention may be embodied in various different forms and is not limited to the embodiments set forth herein.

[0033] In order to clearly explain the present invention, parts unnecessary for the explanation are omitted, and the same reference numerals are used throughout the specification to refer to the same or similar components.

[0034] Furthermore, the size and thickness of each component shown in the drawings are arbitrarily shown for the convenience of explanation, and the present invention is not necessarily limited to those shown in the drawings. In the drawings, thicknesses are exaggerated to clearly show multiple layers and regions. In the drawings, thicknesses of some layers and regions are exaggerated for the convenience of explanation.

[0035] Furthermore, when a layer, film, region, plate, or other part is said to be "on" another part, this does not only mean that it is "directly on" that other part, but also includes cases where there are other parts in between. Conversely, when a part is said to be "directly on" another part, it means that there are no other parts in between. Furthermore, being "on" a reference part means being located above or below the reference part, and does not necessarily mean being "on" in the opposite direction of gravity.

[0036] Furthermore, throughout the specification, when a part is said to "comprise" a certain element, this does not mean that it excludes other elements and may further include other elements, unless specifically stated to the contrary.

[0037] Also, throughout the specification, "on a plane" means when the subject part is viewed from above, and "on a cross section" means when the subject part is cut vertically and viewed from the side.

[0038] Fig. 2 is a perspective view of a battery pack according to an embodiment of the present invention, and Fig. 3 is an exploded perspective view of the battery pack of Fig. 2.

[0039] 2 and 3, a battery pack 1000 according to this embodiment includes a lower pack frame 1100 on which a plurality of battery modules 100 are mounted, and an upper pack frame 1200 located on top of the battery modules 100. The lower pack frame 1100 may include a bottom on which the plurality of battery modules 100 are mounted, and a rigid beam 1170, which may be formed of a reinforcing member. The lower pack frame 1100 and the upper pack frame 1200 are coupled to each other to seal the interior of the battery pack 1000.

[0040] The battery module 100 may include a battery cell stack 120 in which a plurality of battery cells are stacked in a predetermined direction, and module frames 210, 250. The module frames 210, 250 may include an upper frame 210 and a lower frame 250, and the battery cell stack 120 may be mounted between the upper frame 210 and the lower frame 250 to form the battery module 100. However, the module frames 210, 250 are not limited to the above and may be monoframes made of a metal plate material with top, bottom, and both side surfaces integrated together.

[0041] Here, the battery cell is not particularly limited in type and may be a pouch-type secondary battery or a square-type secondary battery, but is preferably a pouch-type secondary battery.

[0042] The rigid beam 1170 may be formed of a reinforcing member. The reinforcing member 2000 may be a damper. When an object is subjected to external vibration or impact and kinetic energy is generated, the damper quickly dissipates the kinetic energy as heat energy due to friction, thereby quickly calming and attenuating the displacement caused by the external vibration or impact.

[0043] The rigid beam 1170 may include a reinforcing member therein. The rigid beam 1170 may include one or more reinforcing members. That is, two or more reinforcing members may be formed inside the rigid beam 1170.

[0044] The reinforcing member may be, but is not limited to, a viscous damper 2100 (FIGS. 4 and 5) or a viscoelastic damper 2500 (FIGS. 6 to 8), as long as it is capable of absorbing external shocks and vibrations. By including a reinforcing member in the rigid beam 1170, it is possible to absorb external vibrations or shocks applied to the battery, thereby improving the rigidity and durability of the battery.

[0045] The rigid beam 1170 may be manufactured by a die casting method in which at least one reinforcing member is placed in a steel mold and then a metal is poured into the steel mold. The metal constituting the rigid beam 1170 may be, for example, aluminum.

[0046] However, the manufacturing method of the rigid beam 1170 is not limited to the above manufacturing method. For example, the rigid beam 1170 may have a hollow structure. In this case, after a reinforcing member is positioned inside the hollow rigid beam 1170, both ends of the reinforcing member may be manufactured to be positioned in contact with the inner surface of the rigid beam 1170.

[0047] The rigid beam 1170 may be positioned in contact with at least two of the internal beams 1110 and the side frame 1150. More specifically, the lower surface of the rigid beam 1170 may be in contact with the bottom surface of the lower pack frame 1100, and the side surface of the rigid beam 1170 may be in contact with at least two of the internal beams 1110 and one side surface of the side frame 1150. In this case, the rigid beam 1170 may be welded to the lower pack frame 1100 or connected using fasteners. For example, the rigid beam 1170 may be connected using bolts and nuts, rivets, or by applying an adhesive. Preferably, the adhesive may be a structural adhesive. The rigid beam 1170 may also be positioned to replace some or all of the internal beams 1110 and the side frame 1150.

[0048] The lower pack frame 1100 has at least two internal beams 1110 and a side frame 1150 formed on the bottom surface of the lower pack frame 1100. More specifically, the lower pack frame 1100 includes at least two internal beams 1110 and a side frame 1150 that protrude from the bottom surface of the lower pack frame 1100 toward the upper frame 1200. Here, the bottom surface of the lower pack frame 1100 may be joined to the at least two internal beams 1110 and the side frame 1150 by a method such as welding.

[0049] The side frame 1150 may extend along the periphery of the bottom surface of the lower pack frame 1100. More specifically, the side frame 1150 may extend along each edge of the bottom surface of the lower pack frame 1100. Here, the top surface of the side frame 1150 may contact the upper pack frame 1200. At this time, the top surface of the side frame 1150 and the upper pack frame 1200 may be joined to each other by a method such as welding, thereby sealing the inside of the battery pack 1000.

[0050] The at least two internal beams 1110 may be cross beams or vertical beams, which may be formed by extrusion.

[0051] The side frame 1150 and the at least two internal beams 1110 may separate the plurality of battery modules 100 from one another. In other words, the plurality of battery modules 100 may be disposed in the area between the side frame 1150 and the at least two internal beams 1110. More specifically, in the battery pack 1000, a pair of battery modules 100 may be disposed between a pair of adjacent internal beams 1110 of the at least two internal beams 1110 and the side frame 1150. Here, the pair of battery modules 100 may be spaced apart and disposed facing each other. For example, the pair of battery modules 100 may be disposed such that end plates (not shown) included in each battery module 100 face each other.

[0052] In this case, the at least two internal beams 1110 may be spaced apart from each other. The distance by which the at least two internal beams 1110 are spaced apart may be the same as or greater than the size of the battery module 100. Furthermore, ends of the internal beams 1110 may contact the inner surfaces of the side frames 1150. More specifically, both ends of the internal beams 1110 may contact the inner surfaces of the side frames 1150, respectively.

[0053] For this purpose, at least two internal beams 1110 and side frames 1150 surround the plurality of battery modules 100, and can protect each battery module 100 from external impacts.

[0054] At least two of the internal beams 1110 may include a rigid beam 1170, and the side frame 1150 may include a rigid beam 1170. Figure 3 shows a case where the internal beam 1110 includes a rigid beam 1170. However, embodiments of the present invention are not limited to this drawing, and various modifications may be made by those of ordinary skill in the art. For example, various embodiments are shown in Figures 9 to 13, which will be described later.

[0055] Fig. 4 is a cross-sectional view taken along line AA' in Fig. 3. Fig. 5 is a view showing the reinforcing member of Fig. 4.

[0056] 4 and 5, the rigid beam 1170 may include a viscous damper 2100, which is a reinforcing member 2000. That is, at least one viscous damper 2100 may be provided inside the rigid beam 1170. The viscous damper 2100 may be positioned vertically inside the rigid beam 1170.

[0057] A1 shows an internal cross section of the viscous damper 2100, which also corresponds to a cross section taken along line B-B' in Figure 3. Referring to this, the viscous damper 2100 may include a viscous fluid 2110 and a piston 2120 located within a cylinder 2130.

[0058] When kinetic energy such as vibration or impact is applied to the battery from the outside, the piston 2120 and the highly viscous fluid 2110 of the viscous damper 2100 move and dissipate the vibration energy in other forms of energy such as thermal energy, thereby offsetting the vibration or impact. In other words, the viscous damper 2100 can reduce the force and displacement applied to the battery and prevent damage to the structure.

[0059] The viscous damper 2100 may include fastening portions 2140 at both ends. Although not shown in the drawings, if the rigid beam 1170 has a hollow structure, the fastening portions 2140 may be coupled to the inner surface of the rigid beam 1170. In this case, the fastening portions 2140 may be coupled to the inner surface of the rigid beam 1170 by welding, or by using fastening members such as bolts, nuts, and rivets, or by applying an adhesive.

[0060] Figure 6 is a cross-sectional view taken along line A-A' in Figure 3. Figure 7 is a view showing the reinforcing member of Figure 6. Figure 8 is a cross-sectional view showing the process in which the reinforcing member of Figure 6 absorbs an external impact.

[0061] 6 to 8, the rigid beam 1170 may include a viscoelastic damper 2500, which is a reinforcing member 2000. That is, at least one viscoelastic damper 2500 may be provided inside the rigid beam 1170. The viscoelastic damper 2500 may be positioned vertically inside the rigid beam 1170.

[0062] A2 shows an internal cross section of the viscoelastic damper 2500. This also corresponds to a cross section taken along line B-B' in FIG. 3. Referring to this, the viscoelastic damper 2500 may include an elastic body 2510 and a steel plate 2520. The elastic body 2510 and the steel plate 2520 have an alternately laminated structure, and the surfaces where the elastic body 2510 and the steel plate 2520 contact each other may be bonded to each other. The elastic body 2510 may be made of a rubber material, preferably high-damping rubber. However, the elastic body 2510 is not limited to this as long as it is made of a material having elasticity.

[0063] When kinetic energy such as vibration or impact is applied to the viscoelastic damper 2500 from the outside, the steel plate 2520 moves in the direction D1 in which the vibration or impact is applied and in the opposite direction D2, and the shape of the elastic body 2510 in contact with the steel plate 2520 changes due to the movement of the steel plate 2520, thereby canceling out the vibration or impact. In other words, the movement of the steel plate 2520 and the elastic body 2510 can dissipate the vibration energy as other forms of energy such as heat energy, thereby canceling out the vibration or impact. Therefore, the viscoelastic damper 2500 can reduce the force and displacement applied to the battery and prevent damage to the structure.

[0064] The viscoelastic damper 2500 may include fastening portions 2540 at both ends. Although not shown in the drawings, if the rigid beam 1170 has a hollow structure, the fastening portions 2540 may be coupled to the inner surface of the rigid beam 1170. In this case, the fastening portions 2540 may be coupled to the inner surface of the rigid beam 1170 by welding, or by using fastening members such as bolts, nuts, and rivets, or by applying an adhesive.

[0065] 9 to 13 are views showing the configuration in which the rigid beam is positioned in the battery pack frame. However, these views are merely examples, and the embodiments of the present invention are not limited thereto and may include all embodiments that can be modified by a person of ordinary skill in the art.

[0066] 9 to 13, the lower pack frame 1100 may include a rigid beam 1170 and an additional beam 1130 positioned thereon.

[0067] The rigid beam 1170 may be positioned while defining the interior of the lower pack frame 1100, and the rigid beam 1170 may be an internal beam 1110. Alternatively, the rigid beam 1170 may be positioned extending along the edge of the bottom surface of the lower pack frame 1100, and the rigid beam 1170 may be a side frame 1150. One surface of the rigid beam 1170 may be positioned in contact with the bottom of the lower pack frame 1100. In other words, at least two internal beams 1110 may include a rigid beam 1170, and the side frame 1150 may include a rigid beam 1170.

[0068] The additional beam 1130 is a beam made of a metal material without including a rigid member. The additional beam 1130 may be positioned to partition the interior of the lower pack frame 1100 or may be positioned to extend along the edge of the bottom surface of the lower pack frame 1100.

[0069] Referring to FIG. 9, the additional beam 1130 may be located inside the lower pack frame 1100 with the inner beam 1110 being a rigid beam 1170 .

[0070] The additional beam 1130 may be positioned by extending along the edge of the bottom surface of the lower pack frame 1100. One surface of the additional beam 1130 may be positioned in contact with the bottom of the lower pack frame 1110.

[0071] Furthermore, the additional beam 1130 may be positioned in contact with one surface of the internal beam 1110, which is the rigid beam 1170. Specifically, one surface of the additional beam 1130 may be positioned in contact with the bottom of the lower pack frame 1100, and the other surface of the additional beam 1130 may be positioned in contact with one surface of the internal beam 1110.

[0072] The additional beam 1130 may be welded to the bottom surface of the lower pack frame 1100 and the inner beam 1110, or may be connected using fasteners such as bolts and nuts, rivets, or adhesive.

[0073] FIG. 10 shows a modification of the embodiment of the present invention disclosed in FIG. 9, and detailed description of the same configuration as that described above will be omitted.

[0074] 10 , the additional beam 1130 may be positioned in contact with the side frame 1150, which is a rigid beam 1170. Specifically, one surface of the additional beam 1130 may be positioned in contact with one surface of the side frame 1150. One surface of the additional beam 1130 may be positioned in contact with the inner surface of the side frame 1150.

[0075] In addition, the additional beam 1130 may be positioned while defining the interior of the lower pack frame 1100. The additional beam 1130 may be positioned in an area where the internal beam 1110, which is the rigid beam 1170, is not present, and may be positioned while defining the interior of the lower pack frame 1100. In other words, the additional beam 1130 may be positioned while replacing the internal beam 1110.

[0076] In this case, instead of the internal beam 1110 including the rigid beam 1170, an additional beam 1130 can separate the battery modules 100 while defining the interior of the lower pack frame 1100.

[0077] FIG. 11 shows a modification of the embodiment of the present invention disclosed in FIGS. 9 and 10, and detailed description of the same configuration as that described above will be omitted.

[0078] Referring to FIG. 11, the additional beam 1130 may be positioned adjacent to the side frame 1150 and the inner beam 1110, which is a rigid beam 1170.

[0079] Specifically, the additional beam 1130 can be positioned in contact with one surface of the side frame 1150. That is, the additional beam 1130 can be positioned in contact with the inner surface or outer surface of the side frame 1150.

[0080] Specifically, one surface of the additional beam 1130 may be in contact with the bottom of the lower pack frame 1100, and the other surface of the additional beam 1130 may be in contact with one surface of the side frame 1150. One surface of the additional beam 1130 may be in contact with the bottom of the lower pack frame 1100, and the other surface of the additional beam 1130 may be in contact with the inner surface of the side frame 1150. Alternatively, one surface of the additional beam 1130 may be in contact with the outer surface of the side frame 1150.

[0081] Additionally, the additional beam 1130 can be positioned in contact with the internal beam 1110. One side of the additional beam 1130 can be positioned in contact with the bottom of the lower pack frame 1100, and the other side of the additional beam 1130 can be positioned in contact with one side of the internal beam 1110.

[0082] In this way, when the additional beam 1130 is positioned in contact with at least two internal beams 1110 and all of the side frames 1150, the durability and rigidity of the battery are improved, and the stability of the battery can be improved.

[0083] FIG. 12 shows a modification of the embodiment of the present invention disclosed in FIGS. 9 to 11, and detailed description of the same configuration as that described above will be omitted.

[0084] Referring to FIG. 12, the additional beam 1130 may be located in an area where the side frame 1150 , which is a rigid beam 1170 , is not present, and may be extended along the edge of the lower pack frame 1100 .

[0085] When the additional beams 1130 are positioned in place of the internal beams 1110 and / or side frames 1150 of the lower pack frame 1100, the thickness of the lower pack frame 1100 is maintained the same, so the durability and rigidity can be improved while the energy density per weight and volume of the battery is maintained constant. Also, since the rigid beams 1170 do not need to be positioned over the entire lower pack frame 1100, manufacturing costs can be reduced.

[0086] FIG. 13 shows a modification of the embodiment of the present invention disclosed in FIGS. 9 to 12, and detailed description of the same configuration as that described above will be omitted.

[0087] Referring to FIG. 13, the additional beam 1130 may be positioned adjacent to the side frame 1150 which is a rigid beam 1170 .

[0088] In addition, the additional beam 1130 can be located in an area where the internal beam 1110, which is the rigid beam 1170, does not exist, and can be located while partitioning the interior of the lower pack frame 1100. In other words, the additional beam 1130 can be located while replacing the internal beam 1110.

[0089] In summary, the additional beam 1130 may be positioned while being coupled to a portion of the lower pack frame 1100 and simultaneously replacing a portion of the lower pack frame 1100. For example, according to the present drawing, the additional beam 1130 may be positioned while replacing at least two or more internal beams 1110 and coupled to the outer surface of the side frame 1150. However, the present invention is not limited to the shape shown in the present drawing and may be modified in various ways.

[0090] The additional beam 1130 can be positioned while being connected to and replacing part of the lower pack frame 1100, allowing the structure of the battery pack frame to be designed as desired by the user, while also improving the rigidity and durability of the battery.

[0091] The present invention is not limited to the embodiments shown in the drawings, but includes all embodiments that can be easily modified by ordinary skilled artisans. That is, although not shown in the drawings, ordinary skilled artisans can modify and implement the design in various embodiments by positioning the additional beam 1130 in various ways on the lower pack frame 1100.

[0092] 14 and 15 are cross-sectional views of a battery pack frame including a reinforcing member in a battery pack according to another embodiment of the present invention.

[0093] 14 and 15, the rigid beam 1170 may include the viscous damper 2100 and the viscoelastic damper 2500, which are the reinforcing member 2000 described above. That is, at least one of the viscous damper 2100 and the viscoelastic damper 2500 may be provided inside the rigid beam 1170. The viscous damper 2100 and the viscoelastic damper 2500 may be positioned horizontally inside the rigid beam 1170.

[0094] The reinforcing members 2000 are positioned in various directions inside the rigid beam 1170, thereby flexibly absorbing vibrations or shocks occurring in various directions, thereby improving the durability and rigidity of the battery.

[0095] Additionally, although not shown in the drawings of this specification, the reinforcing member 2000 may not be located inside the rigid beam 1170, but may be attached to the lower pack frame 1100. Specifically, the reinforcing member 2000 may be attached to one side of at least two or more internal beams 1110 or to one side of the side frame 1150.

[0096] Alternatively, the reinforcing member 2000 itself may be positioned while replacing a portion of the lower pack frame 1100. Specifically, the reinforcing member 2000 itself may replace at least two or more internal beams 1110 or may replace a portion or all of the side frame 1150.

[0097] In this case, the process of connecting the reinforcing member 2000 to the rigid beam 1170 is not required, which improves the efficiency of the manufacturing process and reduces the battery manufacturing costs.

[0098] The battery pack described above can be applied to various devices, including transportation means such as electric bicycles, electric cars, and hybrid cars, but the present invention is not limited thereto and can be applied to various devices that can use a battery pack, which also fall within the scope of the present invention.

[0099] 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 claims also fall within the scope of the present invention. [Explanation of symbols]

[0100] 1000: Battery pack 1100: Lower pack frame 1110: Internal beam 1130: Additional beam 1150: Side frame 1170: Rigid beam 1200: Upper pack frame 2000: Reinforcement member 2100: Viscous damper 2500: Viscoelastic damper

Claims

1. a lower pack frame to which a plurality of battery modules are attached; an upper pack frame positioned above the plurality of battery modules; and a rigid beam included in the lower pack frame; the rigid beam includes a stiffening member including a viscous or viscoelastic damper; The rigid beam is formed of a hollow structure, the reinforcing member is located within the hollow structure of the rigid beam; The fastening portions located at both ends of the reinforcing member are located in contact with the inner surface of the interior of the hollow structure of the rigid beam. Battery pack.

2. Two or more of the reinforcing members are formed inside the hollow structure of the rigid beam. The battery pack according to claim 1 .

3. the lower pack frame includes a bottom on which the plurality of battery modules are mounted, side frames extending along each edge of a bottom surface of the lower pack frame, and an inner beam defining an interior of the lower pack frame. The battery pack according to claim 1 or 2.

4. The rigid beam is included in the inner beam. The battery pack according to claim 3 .

5. a lower pack frame to which a plurality of battery modules are attached; an upper pack frame positioned above the plurality of battery modules; and a rigid beam included in the lower pack frame; the rigid beam includes a stiffening member including a viscous or viscoelastic damper; the lower pack frame includes a bottom on which the plurality of battery modules are mounted, side frames extending along each edge of a bottom surface of the lower pack frame, and an inner beam defining an interior of the lower pack frame; the rigid beam is included in the inner beam; The lower pack frame further includes an additional beam that is a beam of a different material from the rigid beam and is positioned adjacent to the internal beam. Battery pack.

6. a lower pack frame to which a plurality of battery modules are attached; an upper pack frame positioned above the plurality of battery modules; and a rigid beam included in the lower pack frame; the rigid beam includes a stiffening member including a viscous or viscoelastic damper; the lower pack frame includes a bottom on which the plurality of battery modules are mounted, side frames extending along each edge of a bottom surface of the lower pack frame, and an inner beam defining an interior of the lower pack frame; The rigid beam is included in the side frame. Battery pack.

7. The lower pack frame further includes an additional beam that is a beam of a member different from the rigid beam and is positioned in contact with one surface of the side frame. The battery pack according to claim 6.

8. One surface of the additional beam is in contact with the bottom, and the other surface of the additional beam is in contact with the side frame. The battery pack according to claim 7.

9. the lower pack frame includes a bottom on which the plurality of battery modules are mounted, side frames extending along each edge of a bottom surface of the lower pack frame, and an inner beam defining an interior of the lower pack frame; The rigid beam is welded to at least one of the side frame and the internal beam. The battery pack according to claim 1 or 2.

10. The reinforcing member is positioned vertically relative to the bottom of the lower pack frame. The battery pack according to claim 1 or 2.

11. The reinforcing member is positioned horizontally with respect to the bottom of the lower pack frame. The battery pack according to claim 1 or 2.

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