Battery pack

Abstract

According to an exemplary embodiment, a battery pack is provided, the battery pack including: a housing including a plate portion and a side wall, first to third battery modules arranged on the plate portion along a first direction parallel to an upper surface of the plate portion, and a reinforcing band coupled to a first cross beam of the first battery module and a second cross beam of the third battery module.

Description

[Technical field]

[0001] The present invention relates to a battery pack. This application claims the benefit of Korean Application No. 10-2022-0166597, filed on December 2, 2022, and Korean Application No. 10-2023-0035257, filed on March 17, 2023, which are hereby incorporated by reference in their entireties. [Background technology]

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for a variety of wireless devices such as handsets, laptops, and wireless vacuum cleaners. In recent years, the manufacturing cost per unit capacity of secondary batteries has dramatically decreased due to improvements in energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) increases to a level comparable to that of fuel-powered vehicles, the main use of secondary batteries is shifting from mobile devices to mobility.

[0003] When a secondary battery is repeatedly charged and discharged, a swelling phenomenon occurs in which the case of the secondary battery swells due to a chemical reaction of the internal materials. This swelling phenomenon is particularly noticeable in pouch-type battery cells that have relatively weak rigidity. Since the swelling induces changes in the physicochemical properties of the pouch-type battery cell, various technologies for controlling the swelling have been researched. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a battery pack having improved reliability. [Means for solving the problem]

[0005] According to an exemplary embodiment of the present invention for solving the above-mentioned problems, a battery pack is provided, the battery pack includes a housing including a plate portion and a side wall, and first to third battery modules arranged on the plate portion along a first direction parallel to an upper surface of the plate portion, each of the first to third battery modules including a cell stack including a plurality of battery cells and a first cross beam and a second cross beam spaced apart from each other with the cell stack interposed therebetween, the first cross beam and the second cross beam having complementary shapes but different shapes, and a reinforcing band coupled to the first cross beam of the first battery module and the second cross beam of the third battery module.

[0006] The reinforcing band extends along the first direction.

[0007] The reinforcing band is provided in plurality.

[0008] The reinforcement band is disposed on the first battery cell assembly and the second battery cell assembly.

[0009] The battery pack further includes a plurality of fastening members that pass through the reinforcing band and secure the first cross beam of the first battery module and the second cross beam of the third battery module to the plate portion of the housing.

[0010] The battery pack further includes a plurality of fastening members that pass through the reinforcing band and secure the second cross beam of the first battery module and the first cross beam of the second battery module to the plate portion of the housing.

[0011] According to an exemplary embodiment, a battery pack is provided, the battery pack includes: a housing including a plate portion and a side wall, first to third battery modules arranged on the plate portion along a first direction parallel to an upper surface of the plate portion, each of the first to third battery modules including a cell stack including a plurality of battery cells, and a first cross beam and a second cross beam spaced apart from each other with the cell stack interposed therebetween, and a first reinforcing band coupled to the first cross beam of the first battery module, the second cross beam of the first battery module, and the first cross beam of the second battery module.

[0012] The battery pack further includes a plurality of fastening members that pass through the first reinforcing band and secure the first cross beam of the first battery module, the second cross beam of the first battery module, and the first cross beam of the second battery module to the plate portion of the housing.

[0013] The first reinforcement band is disposed on the first battery module.

[0014] The battery pack further includes a second reinforcement band coupled to the second cross beam of the first battery module, the first cross beam of the second battery module, the second cross beam of the second battery module, and the first cross beam of the third battery module.

[0015] The battery pack further includes a plurality of fastening members that pass through the second reinforcement band and secure the second cross beam of the first battery module, the first cross beam of the second battery module, the second cross beam of the second battery module, and the first cross beam of the third battery module to the plate portion of the housing.

[0016] The battery pack further includes a third reinforcement band coupled to the second cross beam of the second battery module, the first cross beam of the third battery module, and the second cross beam of the third battery module.

[0017] The battery pack further includes a plurality of fastening members that pass through the third reinforcement band and secure the second cross beam of the second battery module, the first cross beam of the third battery module, and the second cross beam of the third battery module to the plate portion of the housing. Effect of the Invention

[0018] A battery pack according to an exemplary embodiment of the present invention includes one or more stiffening bands coupled to cross beams of a battery cell assembly, which may prevent swelling of the cell stack and improve the reliability of the battery pack.

[0019] Effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by a person having ordinary skill in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects accompanying the implementation of the exemplary embodiments of the present disclosure can also be derived from the exemplary embodiments of the present disclosure by a person having ordinary skill in the art. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a plan view of a battery pack according to an exemplary embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along the line 1I-1I' in FIG. [Diagram 3] FIG. 2 is a plan view of a battery pack according to an exemplary embodiment. [Figure 4] FIG. 3 is a cross-sectional view taken along line 3I-3I' in FIG. [Diagram 5]FIG. 2 is a plan view of a battery pack according to an exemplary embodiment. [Figure 6] FIG. 2 is a plan view of a battery pack according to an exemplary embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to best describe his own invention.

[0022] Therefore, the embodiment described in this specification and the configurations shown in the drawings are merely the most preferred embodiment of the present invention and do not represent the entire technical idea of ​​the present invention, and there may be various equivalents and modifications that can replace them at the time of this application.

[0023] In addition, in the description of the present invention, if it is determined that a specific description of related publicly known configurations or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0024] Since the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or illustrated roughly for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0025] (First embodiment) FIG. 1 is a plan view illustrating a battery pack 100 according to an exemplary embodiment.

[0026] FIG. 2 is a cross-sectional view taken along line 1I-1I' of FIG.

[0027] 1 and 2, a battery pack 100 may include a housing 110, a plurality of battery cell assemblies 120, a center beam 130, a plurality of exhaust devices 140, a plurality of reinforcing bands 150, and a plurality of fastening members 160. The battery pack 100 is the final form of a battery system to be mounted on a mobility device or the like.

[0028] The housing 110 may provide a space for disposing a plurality of battery cell assemblies 120. The housing 110 may include a plate portion 111 and side walls 112, 113, 114, and 115.

[0029] The plate portion 111 may include an upper surface 111U and a lower surface 111L that are substantially parallel to each other. The upper surface 111U and the lower surface 111L may face each other. Two directions that are substantially parallel to the upper surface 111U of the plate portion 111 are defined as the X direction and the Y direction, and a direction that is substantially perpendicular to the upper surface 111U of the plate portion 111 is defined as the Z direction. Each of the X direction, the Y direction, and the Z direction may be substantially perpendicular to each other. Unless otherwise specified, the definitions of the directions are the same for the following drawings.

[0030] According to an exemplary embodiment, the plate portion 111 may include multiple plates welded together by friction stir welding. If the plate portion 111 is provided by friction stir welding, the plate portion 111 may include an interface between different plates. According to an exemplary embodiment, the plate portion 111 may also be comprised of a single plate.

[0031] The plate portion 111 may include a plurality of cooling channels that are flow paths for a cooling fluid. The plate portion 111 may include a plurality of cavities for reducing the weight of the plate portion 111. Each of the plurality of cooling channels and the plurality of cavities may extend in the X direction.

[0032] The side walls 112, 113, 114, 115 may be coupled to the plate portion 111. The side walls 112, 113, 114, 115 may extend in the Z direction. The side walls 112, 113, 114, 115 may include an internal empty space, which may reduce the weight of the side walls 112, 113, 114, 115.

[0033] The multiple battery cell assemblies 120 may be disposed on an upper surface 111U of the plate portion 111 of the housing 110. The plate portion 111 may support the multiple battery cell assemblies 120. The side walls 112, 113, 114, 115 may surround the multiple battery cell assemblies 120 horizontally.

[0034] Each of the plurality of battery cell assemblies 120 may include a cell stack 121, a first cross beam 125a, and a second cross beam 125b. The cell stack 121 may include a plurality of battery cells.

[0035] A battery cell is the basic unit of a lithium-ion battery, i.e. a secondary battery. A battery cell includes an electrode assembly, an electrolyte, and a case. Battery cells are classified into lithium-ion batteries, lithium-ion polymer batteries, lithium polymer batteries, etc., depending on the configuration of the electrode assembly and electrolyte. Lithium-ion polymer batteries are easy to manufacture, have a low possibility of electrolyte leakage, and increase their occupancy rate within secondary batteries.

[0036] The battery cell may be any one of a cylindrical battery cell, a prismatic battery cell, and a pouch-type battery cell. The electrode assembly of the cylindrical battery cell is housed in a cylindrical metal can. The electrode assembly of the prismatic battery cell is housed in a prismatic metal can. The electrode assembly of the pouch-type battery cell is housed in a pouch case including an aluminum laminate sheet.

[0037] The electrode assembly housed in the battery case includes a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes. Electrode assemblies are classified into a jelly roll type and a stack type according to the assembly form. The jelly roll type is formed by winding up a positive electrode, a negative electrode, and a separator interposed between them. The stack type includes a plurality of positive electrodes, a plurality of negative electrodes, and a plurality of separators interposed between them, which are stacked in sequence.

[0038] According to an exemplary embodiment, the battery cells of the cell stack 121 may be connected in series and / or parallel. As an example, the battery cells may be connected in series to each other. As another example, the battery cells may be connected in parallel to each other. As another example, the cell stack 121 may include a plurality of banks connected in series to each other in parallel, and each of the plurality of banks may include a plurality of battery cells connected in parallel to each other.

[0039] According to an exemplary embodiment, the cell stack 121 may further include a plurality of separators. The plurality of separators may prevent swelling of the plurality of battery cells by supporting the plurality of battery cells horizontally. According to an exemplary embodiment, the plurality of separators may be thermal barriers. According to an exemplary embodiment, each of the plurality of separators may have a high melting temperature and a low thermal conductivity. According to an exemplary embodiment, each of the plurality of separators may include a fire-retardant material, such as a ceramic and a coated glass material. According to an exemplary embodiment, the plurality of separators may also be configured to release a fire retarding material and a fire extinguishing agent in the event of a thermal runaway event.

[0040] The first cross beam 125a and the second cross beam 125b of each of the multiple battery cell assemblies 120 may be spaced apart from each other with the cell stack 121 therebetween. The first cross beam 125a and the second cross beam 125b may cover the sides of the cell stack 121. The first cross beam 125a and the second cross beam 125b may be fixed to the cell stack 121 by an adhesive or the like.

[0041] The plurality of battery cell assemblies 120 may include a first battery cell assembly 120_1, a second battery cell assembly 120_2, and a third battery cell assembly 120_3. The first to third battery cell assemblies 120_1, 120_2, and 120_3 may be arranged along the X direction. The first to third battery cell assemblies 120_1, 120_2, and 120_3 may be arranged in order.

[0042] The first cross beam 125a and the second cross beam 125b may have different shapes from each other. The first cross beam 125a and the second cross beam 125b may have complementary shapes to each other.

[0043] The first cross beam 125a of the first battery cell assembly 120_1 may be coupled to the support base 116 disposed on the plate portion 111. A plurality of fastening members 160 may pass through the reinforcing band 150, the first cross beam 125a, and the support base 116. The plurality of fastening members 160 may include mechanical coupling means such as bolts. The fastening members 160 may be coupled to the plate portion 111. This may fix the first cross beam 125a and the first battery cell assembly 120_1 to the plate portion 111 of the housing 110.

[0044] The second cross beam 125b of the first battery cell assembly 120_1 may be coupled to the first cross beam 125a of the second battery cell assembly 120_2. The second cross beam 125b of the first battery cell assembly 120_1 may interlock with the first cross beam 125a of the second battery cell assembly 120_2. The second cross beam 125b of the first battery cell assembly 120_1 and the first cross beam 125a of the second battery cell assembly 120_2 may constitute a cross beam assembly CBA.

[0045] The second cross beam 125b of the second battery cell assembly 120_2 may be coupled with the first cross beam 125a of the third battery cell assembly 120_3. The second cross beam 125b of the second battery cell assembly 120_2 may interlock with the first cross beam 125a of the third battery cell assembly 120_3. The second cross beam 125b of the second battery cell assembly 120_2 and the first cross beam 125a of the third battery cell assembly 120_3 may constitute a cross beam assembly CBA.

[0046] A plurality of fastening members 160 may be coupled to the plate portion 111 of the housing 110 through the reinforcing band 150 and the second cross beam 125b of the third battery cell assembly 120_3. This allows the reinforcing band 150 and the second cross beam 125b of the third battery cell assembly 120_3 to be fixed to the plate portion 111 of the housing 110.

[0047] The cross beam assembly CBA may be interposed between adjacent cell stacks 121. The cross beam assembly CBA may extend in a direction perpendicular to the center beam 130 (i.e., the Y direction). The cross beam assembly CBA may separate the cell stacks 121 in the X direction.

[0048] According to an exemplary embodiment, each of the reinforcement bands 150 may include an elastic material. According to another exemplary embodiment, each of the reinforcement bands 150 may include a ductile material, such as a metal. Since each of the reinforcement bands 150 is coupled to the first cross beam 125a of the first battery cell assembly 120_1 and the second cross beam 125b of the third battery cell assembly 120_3, swelling of the battery cells of each of the cell stacks 121 of the first to third battery cell assemblies 120_1, 120_2, and 120_3 may be prevented. Also, although two reinforcement bands 150 are shown disposed on the plurality of battery cell assemblies 120 in FIG. 1, three or more reinforcement bands 150 may be disposed on the plurality of battery cell assemblies 120.

[0049] The plurality of battery cell assemblies 120 may be arranged in the X direction and the Y direction. In FIG. 1, the number of the plurality of battery cell assemblies 120 arranged in the X direction is three, and the number of the plurality of battery cell assemblies 120 arranged in the Y direction is two. Therefore, such an arrangement of the plurality of battery cell assemblies 120 can be said to be a 3*2 arrangement. A person of ordinary skill in the art can easily arrive at a plurality of battery cell assemblies 120 arranged in M*N based on what is described herein, where M and N are each an integer greater than or equal to 2.

[0050] The center beam 130 may isolate elements disposed on the housing 110 from one another, thereby allowing the center beam 130 to protect the multiple battery cell assemblies 120 while simultaneously preventing unwanted short circuits therebetween.

[0051] The center beam 130 may extend between the opposing side walls 112, 113, 114, and 115. The center beam 130 may extend in the X direction. The center beam 130 may contact any one of the side walls 112, 113, 114, and 115. The center beam 130 may separate the multiple battery cell assemblies 120 from each other. The center beam 130 may be interposed between the multiple battery cell assemblies 120.

[0052] A plurality of exhaust devices 140 may be coupled to the sidewall 115. At least some of the sidewalls 112, 113, 114, and 115 may include exhaust paths connected to the plurality of exhaust devices 140. The plurality of exhaust devices 140 may be configured to retard thermal propagation by releasing high-temperature gas inside the battery pack 100 to the outside when at least one of the plurality of battery cell assemblies 120 is in a thermal runway state.

[0053] Here, thermal runaway of the battery cell assemblies 120 is a state in which the temperature change of the battery cell assemblies 120 accelerates the temperature change, and is an uncontrollable positive feedback. The battery cell assemblies 120 in the thermal runaway state exhibit a rapid temperature rise and emit a large amount of high-pressure gas and combustion debris.

[0054] The battery pack 100 may further include electrical components. The electrical components may be disposed on the housing 110. The electrical components may be disposed between a side wall 112 on which the exhaust device 140 is installed and the plurality of battery cell assemblies 120. The electrical components may include any electronic elements necessary to operate the battery pack.

[0055] The electrical components may include, for example, a BMS (Battery Management System). The BMS may be configured to monitor, balance, and control the battery pack. Monitoring the battery pack 100 may include measuring the voltage and current of a specific node inside the multiple battery cell assemblies 120, and measuring the temperature at a set position inside the battery pack 100. The battery pack 100 may include instruments for measuring the voltage, current, and temperature described above.

[0056] Balancing the battery pack 100 is an operation to reduce the deviation between the multiple battery cell assemblies 120. Controlling the battery pack 100 includes preventing the occurrence of overcharging, over-discharging and overcurrent. Through monitoring, balancing and control, the battery pack 100 can operate under optimal conditions, thereby preventing a shortening of the life span of each of the multiple battery cell assemblies 120.

[0057] The electrical components may further include a cooling device, a power relay assembly (PRA), a safety plug, and the like. The cooling device may include a cooling fan. The cooling fan may prevent overheating of each of the plurality of battery cell assemblies 120 by circulating air inside the battery pack 100. The PRA may be configured to supply or cut off power from the high-voltage battery to an external load (e.g., a vehicle motor). The PRA may protect the plurality of battery cell assemblies 120 and the external load (e.g., a vehicle motor) by cutting off the power supply to the external load (e.g., a vehicle motor) in a situation where an abnormal voltage such as a voltage surge occurs.

[0058] The battery pack 100 may further include a plurality of bus bars configured to electrically couple the plurality of battery cell assemblies 120. The plurality of battery cell assemblies 120 may be coupled in series by the plurality of bus bars, such that the battery pack 100 may be configured to output a high voltage to an external load (e.g., a vehicle motor).

[0059] The battery pack 100 may further include lead plates coupled to the side walls 112, 113, 114, 115. The lead plates may cover elements disposed inside the battery pack 100, such as the battery cell assemblies 120 and electrical components. The lead plates may be fixed to the battery pack 100 by mechanical coupling means, such as bolts.

[0060] Second embodiment FIG. 3 is a plan view illustrating a battery pack 101 according to an exemplary embodiment.

[0061] FIG. 4 is a cross-sectional view taken along section line 3I-3I' of FIG.

[0062] With reference to FIGS. 3 and 4 , the battery pack 101 may include a housing 110 , a plurality of battery cell assemblies 120 , a center beam 130 , a plurality of vents 140 , a plurality of stiffening bands 150 , and a plurality of fastening members 160 .

[0063] The housing 110, the plurality of battery cell assemblies 120, the center beam 130, the plurality of exhaust devices 140, and the plurality of reinforcement bands 150 are substantially the same as those described with reference to Figures 1 and 2, so duplicate descriptions thereof will be omitted.

[0064] Some of the multiple fastening members 160 may be coupled to the plate portion 111 of the housing 110 by passing through the reinforcement band 150 and the cross beam assembly CBA. Some of the multiple fastening members 160 may be fixed to the plate portion 111 of the housing 110 by passing through the reinforcement band 150, the second cross beam 125b of the first battery cell assembly 120_1, and the first cross beam 125a of the second battery cell assembly 120_2. Some of the multiple fastening members 160 may be fixed to the plate portion 111 of the housing 110 by passing through the reinforcement band 150, the second cross beam 125b of the second battery cell assembly 120_2, and the first cross beam 125a of the third battery cell assembly 120_3.

[0065] According to an exemplary embodiment, each of the reinforcement bands 150 can be secured to each of the first and second cross beams 125a, 125b by a plurality of fastening members 160, thereby preventing swelling of the battery cells of the plurality of battery cell assemblies 120.

[0066] Third embodiment FIG. 5 is a top view of a battery pack 102 according to an exemplary embodiment.

[0067] 5, the battery pack 102 may include a housing 110, a plurality of battery cell assemblies 120, a center beam 130, a plurality of vents 140, a stiffening band 150, and a plurality of fastening members 160. The battery pack 102 of FIG. 5 is the same as the battery pack of FIG. 1, except that each of the plurality of battery cell assemblies 120 overlaps with a single stiffening band 150.

[0068] (Fourth embodiment) FIG. 6 is a plan view of a battery pack 103 according to an exemplary embodiment.

[0069] Referring to FIG. 6 , the battery pack 103 may include a housing 110, a plurality of battery cell assemblies 120, a center beam 130, a plurality of exhaust devices 140, first to third reinforcing bands 151, 152, and 153, and a plurality of fastening members 160.

[0070] The housing 110, the plurality of battery cell assemblies 120, the center beam 130, and the plurality of exhaust devices 140 are substantially the same as those described with reference to Figures 1 and 2, so duplicate descriptions thereof will be omitted.

[0071] The first reinforcement band 151 may overlap the first battery cell assembly 120_1. The first reinforcement band 151 may be coupled to the first cross beam 125a and the second cross beam 125b of the first battery cell assembly 120_1 and the first cross beam 125a of the second battery cell assembly 120_2 by a plurality of fastening members 160.

[0072] The second reinforcement band 152 may overlap the second battery cell assembly 120_2. The second reinforcement band 152 may be coupled to the second cross beam 125b of the first battery cell assembly 120_1, the first cross beam 125a and the second cross beam 125b of the second battery cell assembly 120_2, and the first cross beam 125a of the third battery cell assembly 120_3 by a plurality of fastening members 160.

[0073] The third reinforcement band 153 may overlap the third battery cell assembly 120_3. The third reinforcement band 153 may be coupled to the second cross beam 125b of the second battery cell assembly 120_2 and the first cross beam 125a and the second cross beam 125b of the third battery cell assembly 120_3 by a plurality of fastening members 160.

[0074] The second reinforcement bands 152 may be arranged alternately with the first reinforcement bands 151. The second reinforcement bands 152 may not overlap with the first reinforcement bands 151 in the X-direction. The third reinforcement bands 153 may be arranged alternately with the second reinforcement bands 152. The third reinforcement bands 153 may not overlap with the second reinforcement bands 152 in the X-direction. According to the illustrative embodiment, since each of the battery cell assemblies 120 is reinforced by the first to third reinforcement bands 151, 152, and 153, swelling of the battery cells of the battery cell assemblies 120 may be prevented.

[0075] The present invention has been described in more detail above through the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not fully represent the technical ideas of the present invention, and therefore there may be various equivalents and modifications that can replace them at the time of filing this application. [Explanation of symbols]

[0076] 100, 101, 102, 103 Battery Packs 110 Housing 111 Plate section 111L Bottom 111U top 112, 113, 114, 115 side wall 116 Support stand 120 Battery Cell Assembly 120_1 1st battery cell assembly 120_2 Second battery cell assembly 120_3 3rd battery cell assembly 121 Cell Stack 125a 1st Cross Beam 125b 2nd cross beam 130 Center Beam 140 Exhaust system 150 Reinforcement band 151 First Reinforcement Band 152 Second Reinforcement Band 153 3rd Reinforcement Band 160 Fastening members

Claims

1. a housing including a plate portion and a sidewall; a first battery module, a second battery module and a third battery module arranged on the plate portion along a first direction parallel to an upper surface of the plate portion, each of the first battery module, the second battery module and the third battery module including a cell stack including a plurality of battery cells, and a first cross beam and a second cross beam spaced apart from each other with the cell stack interposed therebetween, the first cross beam and the second cross beam having complementary shapes but different shapes; a reinforcing band coupled to the first cross beam of the first battery module and the second cross beam of the third battery module; Including the battery pack.

2. The battery pack of claim 1 , wherein the reinforcement band extends along the first direction.

3. The battery pack according to claim 1 , wherein a plurality of the reinforcing bands are provided.

4. 10. The battery pack according to claim 1, wherein the stiffening band is disposed on the first battery cell assembly and the second battery cell assembly.

5. 2. The battery pack of claim 1, further comprising a plurality of fastening members passing through the reinforcement band and fastening the first cross beam of the first battery module and the second cross beam of the third battery module to the plate portion of the housing.

6. 2. The battery pack of claim 1, further comprising a plurality of fastening members passing through the reinforcement band and fastening the second cross beam of the first battery module and the first cross beam of the second battery module to the plate portion of the housing.

7. a housing including a plate portion and a sidewall; a first battery module, a second battery module, and a third battery module arranged on the plate portion along a first direction parallel to an upper surface of the plate portion, each of the first battery module, the second battery module, and the third battery module including a cell stack including a plurality of battery cells, and a first cross beam and a second cross beam spaced apart from each other with the cell stack interposed therebetween; a first reinforcement band coupled to the first cross beam of the first battery module, the second cross beam of the first battery module, and the first cross beam of the second battery module; Including the battery pack.

8. 8. The battery pack of claim 7, further comprising a plurality of fastening members passing through the first reinforcement band and fastening the first cross beam of the first battery module, the second cross beam of the first battery module, and the first cross beam of the second battery module to the plate portion of the housing.

9. The battery pack according to claim 7 , wherein the first reinforcement band is disposed on the first battery module.

10. 8. The battery pack of claim 7, further comprising a second reinforcement band coupled to the second cross beam of the first battery module, the first cross beam of the second battery module, the second cross beam of the second battery module, and the first cross beam of the third battery module.

11. 11. The battery pack of claim 10, further comprising a plurality of fastening members passing through the second reinforcement band and fastening the second cross beam of the first battery module, the first cross beam of the second battery module, the second cross beam of the third battery module, and the first cross beam of the third battery module to the plate portion of the housing.

12. 8. The battery pack of claim 7, further comprising a third reinforcement band coupled to the second cross beam of the second battery module, the first cross beam of the third battery module, and the second cross beam of the third battery module.

13. 13. The battery pack of claim 12, further comprising a plurality of fastening members passing through the third reinforcement band and fastening the second cross beam of the second battery module, the first cross beam of the third battery module, and the second cross beam of the third battery module to the plate portion of the housing.

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