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 entirety.

Background Art

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as an energy source for various wireless devices such as handsets, notebook computers, and wireless vacuum cleaners. In recent years, due to improvements in energy density and economies of scale, the manufacturing cost per unit capacity of secondary batteries has decreased dramatically, and as the driving range of battery electric vehicles (BEVs) has increased to a level comparable to that of fuel vehicles, the main application of secondary batteries has shifted from mobile devices to mobility.

[0003] When the charging and discharging of a secondary battery is repeated, a swelling phenomenon occurs in which the case of the secondary battery bulges due to a chemical reaction of the internal substances. Such a swelling phenomenon is particularly prominent in pouch-type battery cells having relatively weak rigidity. Since the above swelling induces changes in the physicochemical properties of the pouch-type battery cell, various techniques for controlling swelling have been studied.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The problem to be solved by the technical idea of the present invention is to provide a battery pack with improved reliability.

Means for Solving the Problems

[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 side walls, and first to third battery modules arranged on the plate portion along a first direction parallel to the upper surface of the plate portion, each of the first to third battery modules including a cell stack containing a plurality of battery cells and a first crossbeam and a second crossbeam spaced apart from each other with the cell stack in between, and the first crossbeam and the second crossbeam having complementary but different shapes, and a reinforcing band coupled to the first crossbeam of the first battery module and the second crossbeam of the third battery module.

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

[0007] Multiple reinforcing bands are provided.

[0008] The reinforcing band described above is placed on the first battery cell assembly and the second battery cell assembly described above.

[0009] The battery pack further includes a plurality of fastening members that penetrate the reinforcing band and fix the first crossbeam of the first battery module and the second crossbeam of the third battery module to the plate portion of the housing.

[0010] The battery pack further includes a plurality of fastening members that penetrate the reinforcing band and fix 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 side walls, and first to third battery modules arranged on the plate portion along a first direction parallel to the upper surface of the plate portion, each of the first to third battery modules including a cell stack containing a plurality of battery cells and a first crossbeam and a second crossbeam spaced apart from each other with the cell stack in between, and a first reinforcing band coupled to the first crossbeam of the first battery module, the second crossbeam of the first battery module, and the first crossbeam of the second battery module.

[0012] The battery pack further includes a plurality of fastening members that penetrate the first reinforcing band and fix 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 reinforcing band is placed on the first battery module.

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

[0015] The battery pack further includes a plurality of fastening members that penetrate the second reinforcing band and fix the second crossbeam of the first battery module, the first crossbeam of the second battery module, the second crossbeam of the second battery module, and the first crossbeam of the third battery module to the plate portion of the housing.

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

[0017] The battery pack further includes a plurality of fastening members that penetrate the third reinforcing band and fix the second crossbeam of the second battery module, the first crossbeam of the third battery module, and the second crossbeam of the third battery module to the plate portion of the housing. [Effects of the Invention]

[0018] An exemplary embodiment of the present invention includes one or more reinforcing bands coupled to the crossbeams of the battery cell assembly. This can prevent swelling of the cell stack and improve the reliability of the battery pack.

[0019] The effects that can be obtained from exemplary embodiments of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly derived and understood by a person of ordinary skill in the art to which the exemplary embodiments of this disclosure belong, from the following description. That is, unintended effects associated with carrying out exemplary embodiments of this disclosure can also be derived by a person of ordinary skill in the art from exemplary embodiments of this disclosure. [Brief explanation of the drawing]

[0020] [Figure 1] This is a plan view showing a battery pack according to an exemplary embodiment. [Figure 2] This is a cross-sectional view along the cutting line 1I-1I' in Figure 1. [Figure 3] This is a plan view showing a battery pack according to an exemplary embodiment. [Figure 4] This is a cross-sectional view along the cutting line 3I-3I' in Figure 3. [Figure 5]It is a plan view showing a battery pack according to an exemplary embodiment. [Figure 6] It is a plan view showing a battery pack according to an exemplary embodiment.

Embodiments for Carrying Out the Invention

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

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

[0023] Also, in the description of the present invention, when it is determined that a specific description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

[0024] The embodiments of the present invention are provided to more fully explain the present invention to an ordinary technician. Therefore, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically illustrated for a clearer explanation. Therefore, the sizes and ratios of each component do not fully reflect the actual sizes and ratios.

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

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

[0027] Referring to Figures 1 and 2, the 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 installed in a mobility device or the like.

[0028] The housing 110 may provide space for arranging multiple battery cell assemblies 120. The housing 110 may include a plate portion 111 and side walls 112, 113, 114, 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 substantially parallel to the upper surface 111U of the plate portion 111 are defined as the X direction and the Y direction, and the direction substantially perpendicular to the upper surface 111U of the plate portion 111 is defined as the Z direction. Each of the X, Y, and Z directions may be substantially perpendicular to each other. Unless otherwise stated, the definitions of directions are the same for the following drawings.

[0030] According to an exemplary embodiment, the plate portion 111 may include a plurality of plates welded together by friction stir welding. When the plate portion 111 is provided by friction stir welding, the plate portion 111 may include interfaces between different plates. According to an exemplary embodiment, the plate portion 111 may also consist of a single plate.

[0031] The plate portion 111 may include a plurality of cooling channels, which are flow paths for the cooling fluid. The plate portion 111 may include a plurality of cavities to reduce 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, and 115 can be connected to the plate portion 111. The side walls 112, 113, 114, and 115 can be extended in the Z direction. The side walls 112, 113, 114, and 115 may include internal empty spaces, thereby reducing their weight.

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

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

[0035] A battery cell is the basic unit of a lithium-ion battery, or secondary battery. A battery cell includes an electrode assembly, electrolyte, and case. Battery cells are classified into lithium-ion batteries, lithium-ion polymer batteries, and lithium polymer batteries based on the configuration of the electrode assembly and electrolyte. Lithium-ion polymer batteries are easier to manufacture due to their lower risk of electrolyte leakage, and their prevalence in secondary batteries is increasing.

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

[0037] The electrode assembly housed in the battery case includes a positive electrode, a negative electrode, and a separator membrane interposed between the positive and negative electrodes. Electrode assemblies are classified into jelly roll type and stack type depending on their assembly configuration. The jelly roll type consists of a rolled assembly of the positive electrode, negative electrode, and separator membrane interposed between them. The stack type includes multiple positive electrodes, multiple negative electrodes, and multiple separator membranes interposed between them, stacked sequentially.

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

[0039] According to exemplary embodiments, the cell stack 121 may further include a plurality of separators. The plurality of separators may prevent the plurality of battery cells from swelling by horizontally supporting the plurality of battery cells. According to exemplary embodiments, the plurality of separators may be thermal barriers. According to exemplary embodiments, each of the plurality of separators may have a high melting temperature and a low thermal conductivity. According to exemplary embodiments, each of the plurality of separators may include a flame retardant material such as ceramic and coated glass material. According to exemplary embodiments, 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 crossbeams 125a and second crossbeams 125b of each of the multiple battery cell assemblies 120 may be spaced apart from each other with the cell stack 121 in between. The first crossbeams 125a and second crossbeams 125b may cover the sides of the cell stack 121. The first crossbeams 125a and second crossbeams 125b may be fixed to the cell stack 121 by an adhesive or the like.

[0041] Multiple 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 crossbeam 125a and the second crossbeam 125b may have different shapes from each other. The first crossbeam 125a and the second crossbeam 125b may have complementary shapes from each other.

[0043] The first crossbeam 125a of the first battery cell assembly 120_1 can be coupled to a support base 116 positioned on the plate portion 111. Multiple fastening members 160 can penetrate the reinforcing band 150, the first crossbeam 125a, and the support base 116. The multiple fastening members 160 may include mechanical fastening means such as bolts. The fastening members 160 can be coupled to the plate portion 111. This allows the first crossbeam 125a and the first battery cell assembly 120_1 to be fixed to the plate portion 111 of the housing 110.

[0044] The second crossbeam 125b of the first battery cell assembly 120_1 can be coupled with the first crossbeam 125a of the second battery cell assembly 120_2. The second crossbeam 125b of the first battery cell assembly 120_1 can mesh with the first crossbeam 125a of the second battery cell assembly 120_2. The second crossbeam 125b of the first battery cell assembly 120_1 and the first crossbeam 125a of the second battery cell assembly 120_2 can constitute a crossbeam assembly CBA.

[0045] The second crossbeam 125b of the second battery cell assembly 120_2 can be coupled with the first crossbeam 125a of the third battery cell assembly 120_3. The second crossbeam 125b of the second battery cell assembly 120_2 can mesh with the first crossbeam 125a of the third battery cell assembly 120_3. The second crossbeam 125b of the second battery cell assembly 120_2 and the first crossbeam 125a of the third battery cell assembly 120_3 can constitute a crossbeam assembly CBA.

[0046] Multiple fastening members 160 can be connected to the plate portion 111 of the housing 110 by passing through the reinforcing band 150 and the second crossbeam 125b of the third battery cell assembly 120_3. This allows the reinforcing band 150 and the second crossbeam 125b of the third battery cell assembly 120_3 to be fixed to the plate portion 111 of the housing 110.

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

[0048] According to an exemplary embodiment, each of the reinforcing bands 150 may contain an elastic material. According to another exemplary embodiment, each of the reinforcing bands 150 may contain a ductile material such as a metal. Each of the reinforcing bands 150 is coupled to the first crossbeam 125a of the first battery cell assembly 120_1 and the second crossbeam 125b of the third battery cell assembly 120_3 so that swelling of the battery cells in the respective cell stacks 121 of the first to third battery cell assemblies 120_1, 120_2, and 120_3 can be prevented. Also, although Figure 1 shows two reinforcing bands 150 arranged on a plurality of battery cell assemblies 120, three or more reinforcing bands 150 may also be arranged on a plurality of battery cell assemblies 120.

[0049] Multiple battery cell assemblies 120 can be arranged in the X and Y directions. In Figure 1, there are three battery cell assemblies 120 arranged in the X direction and two battery cell assemblies 120 arranged in the Y direction. Thus, such an arrangement of multiple battery cell assemblies 120 can be described as a 3*2 arrangement. Based on what has been described here, a typical technician in the industry can easily arrive at an arrangement of multiple battery cell assemblies 120 in an M*N configuration, where M and N are integers greater than or equal to 2.

[0050] The center beam 130 can isolate the elements positioned on the housing 110 from each other. This allows the center beam 130 to protect the multiple battery cell assemblies 120 while simultaneously preventing unwanted short circuits between them.

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

[0052] Multiple exhaust devices 140 may be coupled to the side wall 115. At least some of the side walls 112, 113, 114, and 115 may include exhaust paths connected to the multiple exhaust devices 140. The multiple exhaust devices 140 may be configured to delay thermal propagation by releasing hot gases from inside the battery pack 100 to the outside when at least one of the multiple battery cell assemblies 120 is in a thermal runway state.

[0053] Here, thermal runaway of the multiple battery cell assemblies 120 is a state in which a temperature change in the multiple battery cell assemblies 120 further accelerates that temperature change, resulting in an uncontrollable positive feedback loop. In a thermal runaway state, the multiple battery cell assemblies 120 exhibit a rapid temperature increase and emit large amounts of high-pressure gas and combustion residue.

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

[0055] Electrical components may include, for example, a Battery Management System (BMS). The BMS may be configured to perform tasks such as monitoring, balancing, and controlling the battery pack. Monitoring of the battery pack 100 may include measuring the voltage and current at specific nodes within a plurality of battery cell assemblies 120, and measuring the temperature at a set location within the battery pack 100. The battery pack 100 may include measuring instruments for measuring the aforementioned voltage, current, and temperature.

[0056] Balancing the battery pack 100 is an operation that reduces deviations between multiple battery cell assemblies 120. Control of the battery pack 100 includes preventing overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack 100 can operate under optimal conditions, thereby preventing shortening of the lifespan of each of the multiple battery cell assemblies 120.

[0057] The electrical components may further include a cooling system, a Power Relay Assembly (PRA), and a safety plug. The cooling system may include a cooling fan. The cooling fan can prevent each of the multiple battery cell assemblies 120 from overheating 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., the vehicle's motor). The PRA can protect the multiple battery cell assemblies 120 and the external load (e.g., the vehicle's motor) by cutting off the power supply to the external load (e.g., the vehicle's motor) in situations where abnormal voltages occur, such as voltage surges.

[0058] The battery pack 100 may further include a plurality of busbars configured to electrically connect a plurality of battery cell assemblies 120. The plurality of battery cell assemblies 120 may be connected in series by the plurality of busbars. This may configure the battery pack 100 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, and 115. The lead plates may cover elements located inside the battery pack 100, such as the battery cell assembly 120 and electrical components. The lead plates may be secured to the battery pack 100 by mechanical coupling means, such as bolts.

[0060] (Second Embodiment) Figure 3 is a plan view showing a battery pack 101 according to an exemplary embodiment.

[0061] Figure 4 is a cross-sectional view along the cutting line 3I-3I' in Figure 3.

[0062] Referring to Figures 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 exhaust devices 140, a plurality of reinforcing bands 150, and a plurality of fastening members 160.

[0063] The housing 110, the multiple battery cell assemblies 120, the center beam 130, the multiple exhaust devices 140, and the multiple reinforcing bands 150 are substantially the same as those described with reference to Figures 1 and 2, so redundant descriptions of them are omitted.

[0064] Some of the multiple fastening members 160 can penetrate the reinforcing band 150 and the crossbeam assembly CBA and be coupled to the plate portion 111 of the housing 110. Some of the multiple fastening members 160 can penetrate the reinforcing band 150, the second crossbeam 125b of the first battery cell assembly 120_1, and the first crossbeam 125a of the second battery cell assembly 120_2 and be fixed to the plate portion 111 of the housing 110. Some of the multiple fastening members 160 can penetrate the reinforcing band 150, the second crossbeam 125b of the second battery cell assembly 120_2, and the first crossbeam 125a of the third battery cell assembly 120_3 and be fixed to the plate portion 111 of the housing 110.

[0065] According to an exemplary embodiment, each of the reinforcing bands 150 may be fastened to the first crossbeam 125a and the second crossbeam 125b, respectively, by a plurality of fastening members 160, thereby preventing swelling of the battery cells in the plurality of battery cell assemblies 120.

[0066] (Third embodiment) Figure 5 is a plan view showing a battery pack 102 according to an exemplary embodiment.

[0067] Referring to Figure 5, the battery pack 102 may include a housing 110, a plurality of battery cell assemblies 120, a center beam 130, a plurality of exhaust devices 140, reinforcing bands 150, and a plurality of fastening members 160. The battery pack 102 in Figure 5 is the same as the battery pack in Figure 1, except that each of the plurality of battery cell assemblies 120 overlaps with a single reinforcing band 150.

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

[0069] Referring to Figure 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, 153, and a plurality of fastening members 160.

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

[0071] The first reinforcing band 151 may overlap with the first battery cell assembly 120_1. The first reinforcing band 151 may be connected by a plurality of fastening members 160 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.

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

[0073] The third reinforcing band 153 may overlap with the third battery cell assembly 120_3. The third reinforcing band 153 may be connected to the second crossbeam 125b of the second battery cell assembly 120_2 and the first crossbeam 125a and second crossbeam 125b of the third battery cell assembly 120_3 by a plurality of fastening members 160.

[0074] The second reinforcing band 152 may be arranged alternately with the first reinforcing band 151. The second reinforcing band 152 may not overlap with the first reinforcing band 151 in the X direction. The third reinforcing band 153 may be arranged alternately with the second reinforcing band 152. The third reinforcing band 153 may not overlap with the second reinforcing band 152 in the X direction. According to an exemplary embodiment, each of the battery cell assemblies 120 is reinforced by the first to third reinforcing bands 151, 152, and 153, so that swelling of the battery cells in the battery cell assemblies 120 can be prevented.

[0075] The present invention has been described in more detail above through the drawings and embodiments. However, the configurations described in the drawings or embodiments described herein are merely one embodiment of the present invention and do not represent the entire technical concept of the present invention. Therefore, there may be various equivalents and modifications that can substitute for them at the time of filing. [Explanation of Symbols]

[0076] 100, 101, 102, 103 Battery Packs 110 Housing 111 Plate section 111L bottom surface 111U top 112, 113, 114, 115 side wall 116 Support stand 120 Battery Cell Assembly 120_1 First Battery Cell Assembly 120_2 Second Battery Cell Assembly 120_3 Third Battery Cell Assembly 121 Cell Stack 125a First Crossbeam 125b Second Crossbeam 130 Center Beam 140 Exhaust system 150 Reinforcement Bands 151 First reinforcement band 152 Second reinforcement band 153 Third reinforcement band 160 Fastening members

Claims

1. A housing including a plate section and side walls, A first battery module, a second battery module, and a third battery module are arranged on the plate portion along a first direction parallel to the upper surface of the plate portion, wherein each of the first battery module, the second battery module, and the third battery module includes a cell stack containing a plurality of battery cells and a first crossbeam and a second crossbeam spaced apart from each other with the cell stack in between, and the first crossbeam and the second crossbeam have complementary shapes but different shapes, A reinforcing band connected to the first crossbeam of the first battery module and the second crossbeam of the third battery module, In a battery pack including, The second battery module is located between the first battery module and the third battery module. The second crossbeam of the first battery module faces the first crossbeam of the second battery module, and The second crossbeam of the second battery module faces the first crossbeam of the third battery module. The battery pack further includes a plurality of fastening members that penetrate the reinforcing band, the first crossbeam of the first battery module, and the second crossbeam of the third battery module, and fix the first crossbeam of the first battery module and the second crossbeam of the third battery module to the plate portion of the housing.

2. A housing including a plate section and side walls, A first battery module, a second battery module, and a third battery module are arranged on the plate portion along a first direction parallel to the upper surface of the plate portion, wherein each of the first battery module, the second battery module, and the third battery module includes a cell stack containing a plurality of battery cells and a first crossbeam and a second crossbeam spaced apart from each other with the cell stack in between, and the first crossbeam and the second crossbeam have complementary shapes but different shapes, A reinforcing band connected to the first crossbeam of the first battery module and the second crossbeam of the third battery module, In a battery pack including, The second battery module is located between the first battery module and the third battery module. The second crossbeam of the first battery module faces the first crossbeam of the second battery module, and The second crossbeam of the second battery module faces the first crossbeam of the third battery module. The battery pack further includes a plurality of fastening members that penetrate the reinforcing band, the second crossbeam of the first battery module, and the first crossbeam of the second battery module, and fix the second crossbeam of the first battery module and the first crossbeam of the second battery module to the plate portion of the housing.

3. The battery pack according to claim 1 or 2, wherein the reinforcing band extends along the first direction.

4. The battery pack according to claim 1 or 2, wherein a plurality of reinforcing bands are provided.

5. The battery pack according to claim 1 or 2, wherein the reinforcing band is disposed on the first battery cell assembly and the second battery cell assembly.

6. A housing including a plate section and side walls, A first battery module, a second battery module, and a third battery module are arranged on the plate portion along a first direction parallel to the upper surface of the plate portion, wherein each of the first battery module, the second battery module, and the third battery module includes a cell stack containing a plurality of battery cells and a first cross beam and a second cross beam spaced apart from each other with the cell stack in between. The first crossbeam of the first battery module, the second crossbeam of the first battery module, and the first reinforcing band coupled to the first crossbeam of the second battery module, Multiple fastening members that penetrate the first reinforcing band, the first crossbeam of the first battery module, the second crossbeam of the first battery module, and the first crossbeam of the second battery module, and fix the first crossbeam of the first battery module, the second crossbeam of the first battery module, and the first crossbeam of the second battery module to the plate portion of the housing, A battery pack, including the battery pack.

7. The battery pack according to claim 6, wherein the first reinforcing band is disposed on the first battery module.

8. The battery pack according to claim 6, further comprising a second reinforcing band coupled to the second crossbeam of the first battery module, the first crossbeam of the second battery module, the second crossbeam of the second battery module, and the first crossbeam of the third battery module.

9. The battery pack according to claim 8, further comprising a plurality of fastening members that penetrate the second reinforcing band and fix the second crossbeam of the first battery module, the first crossbeam of the second battery module, the second crossbeam of the second battery module, and the first crossbeam of the third battery module to the plate portion of the housing.

10. The battery pack according to claim 6, further comprising the second crossbeam of the second battery module, the first crossbeam of the third battery module, and a third reinforcing band coupled to the second crossbeam of the third battery module.

11. The battery pack according to claim 10, further comprising a plurality of fastening members that penetrate the third reinforcing band and fix the second crossbeam of the second battery module, the first crossbeam of the third battery module, and the second crossbeam of the third battery module to the plate portion of the housing.

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