Battery pack

Abstract

According to exemplary embodiments of the present invention, a battery pack is provided. The battery pack includes a pack housing including a base plate and side walls; a first crossbeam and a second crossbeam disposed on the pack housing and spaced apart in a first direction parallel to the mounting surface of the base plate and extending in a second direction parallel to the mounting surface of the base plate; a battery cell assembly interposed between the first crossbeam and the second crossbeam; a lid coupled to the side walls and covering the battery cell assembly; and a reinforcing bracket coupled to the lid and extending along the first direction.

Description

Technical Field

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[0001] The present invention relates to a battery pack. This application claims the benefit of Korean Application No. 10-2023-0160100, filed on November 20, 2023, which is hereby incorporated by reference in its 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 use of secondary batteries has shifted from mobile devices to mobility.

[0003] The trend in the technological development of secondary batteries for mobility is the improvement of energy density and safety. Here, the energy density of a secondary battery is the value obtained by dividing the maximum electrical energy that the secondary battery can store by the mass of the secondary battery. Since a high energy density of a secondary battery directly relates to the driving efficiency and driving range of mobility, various studies have been conducted to improve the energy density of secondary batteries.

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 safety.

Means for Solving the Problems

[0005] According to an exemplary embodiment for solving the above-mentioned problems, a battery pack is provided. The battery pack includes a pack housing including a base plate and a side wall; a first cross beam and a second cross beam disposed on the pack housing and spaced apart in a first direction parallel to the mounting surface of the base plate and extending in a second direction parallel to the mounting surface of the base plate; a battery cell assembly interposed between the first cross beam and the second cross beam; a lid coupled to the side wall and covering the battery cell assembly; and a reinforcing bracket coupled to the lid and extending along the first direction.

[0006] The reinforcing bracket is joined to the lid by spot welding.

[0007] The reinforcing bracket described above is connected to the first crossbeam and the second crossbeam.

[0008] The above-mentioned reinforcing bracket has a flat plate shape.

[0009] The above reinforcing bracket includes a corrugated structure.

[0010] The lid includes a first base and a first raised portion that is further from the base plate than the first base.

[0011] The reinforcing bracket includes a second base and a second raised portion that is further from the base plate than the second base.

[0012] The second raised portion described above overlaps with the first raised portion described above in a third direction perpendicular to the mounting surface of the base plate.

[0013] A battery pack characterized in that two or more of the second raised portions described above overlap with one of the second raised portions described above in the third direction described above.

[0014] The second raised portion is welded to the first raised portion.

[0015] The second base described above is welded to the first base described above.

[0016] The reinforcing bracket is welded to the first base of the lid and separated from the first raised portion.

[0017] The above lid includes a wave-shaped structure that overlaps with the above reinforcing bracket.

[0018] According to an exemplary embodiment, a battery pack is provided. The battery pack includes a pack housing including a base plate and side walls, a battery cell assembly disposed on the pack housing, the battery cell assembly including a plurality of battery cells, a first cross beam and a second cross beam spaced apart in a first direction with the plurality of battery cells in between, a lid coupled to the side walls, and a reinforcing bracket extending in the first direction and welded to the lid.

[0019] The reinforcing bracket described above is connected to the first crossbeam and the second crossbeam. [Effects of the Invention]

[0020] An exemplary embodiment of the present invention may include a bracket welded to the lid. This prevents damage to the lid due to vibration of the battery pack and swelling of the battery cells.

[0021] 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 Description of the Drawings

[0022] [Figure 1] It is a plan view showing a battery pack according to an exemplary embodiment. [Figure 2] It is a cross-sectional view taken along the cutting line 1I-1I' of FIG. 1. [Figure 3] It is a cross-sectional view of a lid and a reinforcing bracket. [Figure 4] It is a cross-sectional view for explaining a battery cell assembly according to another exemplary embodiment. [Figure 5] It is a cross-sectional view of a lid and a reinforcing bracket. [Figure 6] It is a plan view showing a battery pack according to another exemplary embodiment.

Modes for Carrying Out the Invention

[0023] 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 are not to be construed as being limited to the ordinary or dictionary meanings, but can 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.

[0024] 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 ideas of the present invention. So, there can be various equivalents and modifications that can replace them at the time of this application.

[0025] 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.

[0026] Since embodiments of the present invention are provided to give a more complete explanation to an ordinary person of the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown schematically for the sake of clarity. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes and proportions.

[0027] (First Embodiment) Figure 1 is a plan view showing a battery pack 100 according to an exemplary embodiment. In Figure 1, the lid 160 is omitted to allow for a more complete understanding of the positional relationships between the elements of the battery pack 100.

[0028] Figure 2 is a cross-sectional view along the cutting line 1I-1I' in Figure 1.

[0029] Figure 3 is a cross-sectional view of the lid 160 and the reinforcing bracket 150. More specifically, Figure 3 is the portion corresponding to the cutting line 1II-1II' in Figure 1.

[0030] Referring to Figures 1 to 3, the battery pack 100 may include a pack housing 110, multiple battery cell assemblies 120, a center beam 131, a cross beam 133, an exhaust device 140, a reinforcing bracket 150, a lid 160, and a mounting device 17. The battery pack 100 is the final form of a battery system installed in a mobility device or the like.

[0031] The pack housing 110 may include a base plate 110B and a side wall 110S. Here, two directions substantially parallel to the mounting surface 110M of the base plate 110B are defined as the X and Y directions, and the direction substantially perpendicular to the mounting surface 110M of the base plate 110B is defined as the Z direction. The X, Y, and Z directions may be substantially perpendicular to each other.

[0032] The base plate 110B may have a flat shape. The side wall 110S may be substantially perpendicular to the base plate 110B. The side wall 110S may be adjacent to the edge portion of the base plate 110B. The side wall 110S may be coupled to the edge portion of the base plate 110B.

[0033] The base plate 110B and the side wall 110S can each be supplied by an extrusion process. The base plate 110B may include multiple plates joined by friction stir welding.

[0034] Multiple battery cell assemblies 120 can be arranged on the mounting surface 110M of the base plate 110B of the pack housing 110. The battery cell assemblies 120 can be arranged in the X and Y directions. In this example, three battery cell assemblies 120 are arranged in the X direction and two battery cell assemblies are arranged in the Y direction, and the multiple battery cell assemblies 120 form a 2x3 matrix, but this is for illustrative purposes only and does not limit the technical idea of ​​the present invention in any way.

[0035] The base plate 110B can support multiple battery cell assemblies 120. The side wall 110S can horizontally enclose multiple battery cell assemblies 120.

[0036] The technical idea of ​​the present invention will be described below with reference to embodiments in which the battery pack 100 is of a moduleless type and each of the multiple battery cell assemblies 120 does not include a module frame. However, this is a non-limiting example and does not limit the technical idea of ​​the present invention in any sense. A person of ordinary skill in the art can easily arrive at multiple battery cell assemblies including a module frame and a module-type battery pack including therein based on what is described herein.

[0037] Each of the multiple battery cell assemblies 120 may include multiple battery cells 121 and a separator 122. Each of the multiple battery cells 121 may include an electrode assembly, electrolyte, and case.

[0038] Each of the multiple battery cells 121 may be 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.

[0039] An electrode assembly includes a positive electrode, a negative electrode, and a separator membrane interposed between the positive and negative electrodes. A jelly roll type electrode assembly consists of a rolled-up positive electrode, a negative electrode, and a separator membrane interposed between them. A stack type electrode assembly includes multiple positive electrodes, multiple negative electrodes, and multiple separator membranes interposed between them, stacked sequentially.

[0040] According to an exemplary embodiment, a plurality of battery cells 121 can constitute a plurality of banks. A plurality of banks may include one or more parallel-connected battery cells 121. The plurality of banks may be connected in series with one another. The number of battery cells 121 included in each of the plurality of banks and the number of banks connected in series with one another can be determined according to the voltage and current to be output through each of the plurality of battery cell assemblies 120.

[0041] According to an exemplary embodiment, the cell stack may further include a plurality of separators 122. The plurality of separators 122 can prevent the plurality of battery cells from swelling by horizontally supporting the plurality of battery cells 121. According to an exemplary embodiment, the plurality of separators 122 may be a thermal barrier. According to an exemplary embodiment, each of the plurality of separators 122 may have a high melting temperature and a low thermal conductivity. According to an exemplary embodiment, each of the plurality of separators 122 may include a flame retardant material such as ceramic and coated glass material. According to an exemplary embodiment, the plurality of separators 122 may be configured to release a fire retarding material and a fire extinguishing agent in the event of a thermal runaway event.

[0042] The center beam 131 can be surrounded by side walls 110S. This allows the center beam to divide the space defined by the pack housing 110. The center beam 131 may be included in one of the multiple plates of the base plate 110B and may be formed together with one of the multiple plates by an extrusion process, or it may be welded to one of the multiple plates of the base plate 110B.

[0043] The center beam 131 can be extended along the X direction. The center beam 131 can isolate the battery cell assembly 120 in the Y direction. The center beam 131 can be interposed between the battery cell assemblies 120.

[0044] The crossbeam 133 can be extended along the Y direction. The crossbeam 133 can isolate multiple battery cell assemblies 120 in the X direction. In the X direction, the crossbeam 133 can be interposed between the battery cell assemblies 120 or between the battery cell assemblies 120 and the side wall 110S. In the Y direction, the crossbeam 133 can be interposed between the side wall 110S and the center beam 131.

[0045] The exhaust device 140 can be coupled to any one of the side walls 110S. The side wall 110S coupled to the exhaust device 140 may include an exhaust path connected to the exhaust device 140. The exhaust device 140 can be configured to slow down thermal propagation by releasing hot gas 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.

[0046] Here, thermal runaway of the multiple battery cell assemblies 120 is a state in which the temperature change of the multiple battery cell assemblies 120 is further accelerated, 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.

[0047] The lid 160 can be coupled to the side wall 110S. The lid can cover elements located inside the battery pack 100, such as the battery cell assembly 120 and electrical components. The lid can be secured to the battery pack 100 by mechanical coupling means, such as bolts.

[0048] The reinforcing bracket 150 can be extended in the X direction. Each of the reinforcing brackets 150 can overlap with a plurality of battery cell assemblies 120 in the Z direction. In this example, each of the reinforcing brackets 150 can overlap with each of the battery cell assemblies 120 arranged in the respective extension direction of the reinforcing bracket 150 (i.e., the X direction) in the Z direction. In Figure 1, each of the reinforcing brackets 150 overlaps with three battery cell assemblies 120, but this is for illustrative purposes only and does not limit the technical idea of ​​the present invention in any way. Based on what is described herein, embodiments in which each of the reinforcing brackets 150 overlaps with two or more battery cell assemblies can be easily arrived at.

[0049] According to an exemplary embodiment, the reinforcing bracket 150 can overlap with a plurality of crossbeams 133 in the Z direction. According to an exemplary embodiment, the reinforcing bracket 150 can be coupled with a plurality of crossbeams 133. In the example, each of the reinforcing brackets 150 can be coupled with crossbeams 133 arranged in the respective extension direction of the reinforcing bracket 150 (i.e., the X direction). In Figure 1, each of the reinforcing brackets 150 is coupled with four crossbeams 133, but this is for illustrative purposes only and does not limit the technical idea of ​​the invention in any sense. A person of ordinary skill in the art can easily arrive at embodiments in which each of the reinforcing brackets 150 is coupled with two or more crossbeams based on what is described herein.

[0050] The reinforcing bracket 150 can be connected to each of the crossbeams 133 arranged in the X direction by a fastener 170. The fastener 170 may be a mechanical fastening means, such as a bolt. In addition to the reinforcing bracket 150, the fastener 170 can also fasten the lid 160 to the crossbeam 133.

[0051] Each of the reinforcing brackets 150 may include a base 151, a raised portion 155, and a connecting portion 153. Each of the reinforcing brackets 150 may include a corrugated structural CGS in the Y direction. Repeats of the base 151, raised portion 155, and connecting portion 153 can constitute a corrugated structural CGS. The base 151, raised portion 155, and connecting portion 153 can be arranged in the Y direction. The inclusion of a corrugated structural CGS in the Y direction of the reinforcing bracket 150 means that the position in the Z direction of each part of the reinforcing bracket 150 varies in a corrugated manner according to its position in the Y direction.

[0052] The raised portion 155 can be raised upward from the base 151. The distance from each of the raised portions 155 to the base plate 110B may be different from the distance from the base 151 to the base plate 110B. The distance from each of the raised portions 155 to the base plate 110B may be greater than the distance from the base 151 to the base plate 110B.

[0053] The connecting portion 153 can connect the base 151 and the raised portion 155. Each of the base 151 and the raised portion 155 may be substantially parallel to the mounting surface 110M of the base plate 110B. Each of the connecting portions 153 may include either an inclined surface or a curved surface. Each of the connecting portions 153 may be oblique to the mounting surface 110M of the base plate 110B, for example.

[0054] The lid 160 may include a base 161, a raised portion 165, and a connecting portion 163. The base 161, the raised portion 165, and the connecting portion 163 may be arranged in the Y direction. In addition to the raised portion 165 and the connecting portion 163 that overlap with the reinforcing bracket 150, the lid 160 may further include additional raised portions and connecting portions.

[0055] Each of the raised portions 165 can be raised upward from the base 161. The distance from each of the raised portions 165 to the base plate 110B may be different from the distance from the base 161 to the base plate 110B. The distance from each of the raised portions 165 to the base plate 110B may be greater than the distance from the base 161 to the base plate 110B.

[0056] The connecting portion 163 can connect the base 161 and the raised portion 165. Each of the base 161 and the raised portion 165 may be substantially parallel to the mounting surface 110M of the base plate 110B. Each of the connecting portions 163 may include either an inclined surface or a curved surface. Each of the connecting portions 163 may be oblique to the mounting surface 110M of the base plate 110B, for example.

[0057] Base 151 can overlap base 161 in the Z direction. Base 151 can be in contact with base 161. Base 151 can be welded to base 161. This provides a first weld WP1 to bases 151 and 161. The first weld WP1 can be formed, for example, by spot welding.

[0058] The raised portion 155 can overlap with the raised portion 165 in the Z direction. According to an exemplary embodiment, multiple (e.g., two or more) raised portions 155 can overlap with the raised portion 165 in the Z direction. The raised portion 155 can be in contact with the raised portion 165. The raised portion 155 can be welded to the raised portion 165. This provides a second weld WP2 to the raised portions 155 and 165. The second weld WP2 can be formed, for example, by spot welding.

[0059] According to an exemplary embodiment, the reinforcing bracket 150 can be coupled to the lid 160 in addition to being coupled to the crossbeam 133. The reinforcing bracket 150 can reinforce the rigidity of the lid 160 and can provide a structure that can withstand uniform surface pressure above and below the battery cell assembly 120, respectively, when multiple battery cells 121 are swollen. More specifically, a base plate 110B with high mechanical rigidity can be provided below the battery cell assembly 120, and a coupling structure between the reinforcing bracket 150 and the lid 160 can be provided above the battery cell assembly 120. This can prevent the lid 160 from being damaged when multiple battery cells 121 are swollen and can equalize the pressure distribution around the battery cell assembly 120.

[0060] The battery pack 100 may further include an interbus bar. The interbus bar allows multiple battery cell assemblies 120 to be connected in series, enabling the battery pack 100 to output a higher voltage.

[0061] The battery pack 100 may further include electrical components. The electrical components may be arranged on the pack housing 110. The electrical components may be arranged between one of the side walls 110S on which the exhaust device 140 is installed and a plurality of battery cell assemblies 120.

[0062] The electrical components may include, for example, a BMS (Battery Management System). The BMS can 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 sensors for measuring the aforementioned voltage, current, and temperature.

[0063] 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.

[0064] The electrical components may further include a cooling system, a Power Relay Assembly (PRA), a safety plug, and the like. 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 can 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.

[0065] (Second Embodiment) Figure 4 is a cross-sectional view illustrating a battery cell assembly 120' according to another exemplary embodiment.

[0066] Referring to Figure 4, the battery cell assembly 120' can include multiple battery cells 121, a separator 122, a first crossbeam 125A, and a second crossbeam 125B. In Figure 4, the battery cells 121, separator 122, base plate 110B, reinforcing bracket 150, lid 160, and fixture 170 are substantially the same as those described with reference to Figures 1 to 3, so redundant descriptions of them are omitted.

[0067] The first crossbeam 125A and the second crossbeam 125B can be spaced apart with multiple battery cells 121 in between. The first crossbeam 125A and the second crossbeam 125B can be bonded to the multiple battery cells 121 using means such as adhesive. The first crossbeam 125A and the second crossbeam 125B can have different and complementary shapes. This allows each first crossbeam 125A of a battery cell assembly 120' to be bonded to the second crossbeam 125B of a preceding battery cell assembly 120', and each second crossbeam 125B of a battery cell assembly 120' to be bonded to the first crossbeam 125A of a subsequent battery cell assembly 120'. There may be a clearance between the bonded first crossbeams 125A and second crossbeams 125B to account for manufacturing tolerances.

[0068] Each of the multiple battery cell assemblies 120 in Figures 1 and 2 can be replaced by a battery cell assembly 120', and the crossbeam 133 can be omitted. This allows the reinforcing bracket 150 to be coupled to the first crossbeam 125A and the second crossbeam 125B of the battery cell assembly 120' by a fixture 170.

[0069] (Third embodiment) Figure 5 is a cross-sectional view of the lid 160' and the reinforcing bracket 150'.

[0070] Referring to Figure 5, the reinforcing bracket 150' may be substantially flat. The reinforcing bracket 150' may include a flat plate shape. The reinforcing bracket 150' does not have to include a corrugated structure. The reinforcing bracket 150' can replace the reinforcing bracket 150 in Figure 3.

[0071] In this example, the shape of the lid 160' can be changed in accordance with the change in the shape of the reinforcing bracket 150'. More specifically, the lid 160' may include a wave-shaped structure CGS' that overlaps with the reinforcing bracket 150'. Repeats of the base 161', raised portion 165', and connecting portion 163 can constitute the wave-shaped structure CGS'. The base 161', raised portion 165', and connecting portion 153 can be arranged in the Y direction. The lid 160' may include an increased number of raised portions 165' and connecting portions 153 compared to the lid in Figure 3. The reinforcing bracket 150' may overlap with two or more raised portions 165' in the Z direction.

[0072] According to an exemplary embodiment, since the reinforcing bracket 150' has a flat plate shape, the reinforcing bracket 150' can be separated from the raised portion 165' of the lid 160'.

[0073] The base 161' of the reinforcing bracket 150' and the lid 160' can be joined, for example, by spot welding. A first weld PW1 can be provided on the base 161' of the reinforcing bracket 150' and the lid 160'.

[0074] (Fourth Embodiment) Figure 6 is a plan view showing a battery pack 101 according to another exemplary embodiment.

[0075] The battery pack 101 may include a pack housing 110, multiple battery cell assemblies 120, a center beam 131, a cross beam 133, an exhaust device 140, a reinforcing bracket 150'', a lid 160, and a mounting device 17. The battery pack 101 is the final form of a battery system to be installed in a mobility vehicle or the like.

[0076] Reinforcement bracket 150'' is substantially the same as the reinforcement bracket 150 described with reference to Figures 1 to 3, except for its length in the X direction and the resulting connection to the cross beam 133.

[0077] In this example, the reinforcing bracket 150'' may have a reduced length compared to the reinforcing bracket 150 in Figure 1. Each of the reinforcing brackets 150'' can overlap with a corresponding battery cell assembly 120 in the Z direction. Each of the reinforcing brackets 150'' can overlap with one battery cell assembly 120 in the Z direction. Each of the reinforcing brackets 150'' can be coupled to two adjacent crossbeams 133. In Figure 6, four crossbeams 133 are arranged in the X direction, and three reinforcing brackets 150'' can be coupled to adjacent crossbeams 133.

[0078] The present invention has been described in more detail above with reference to 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 a variety of equivalents and modifications that can be substituted for them at the time of filing.

Claims

1. A pack housing including a base plate and side walls, A first cross beam and a second cross beam are arranged on the pack housing, spaced apart in a first direction parallel to the mounting surface of the base plate, and extending in a second direction parallel to the mounting surface of the base plate, A battery cell assembly interposed between the first crossbeam and the second crossbeam, A lid coupled to the side wall and covering the battery cell assembly, A reinforcing bracket connected to the lid and extending along the first direction, Includes a battery pack.

2. The battery pack according to claim 1, wherein the reinforcing bracket is joined to the lid by spot welding.

3. The battery pack according to claim 1, wherein the reinforcing bracket is coupled to the first crossbeam and the second crossbeam.

4. The battery pack according to claim 1, wherein the reinforcing bracket has a flat plate shape.

5. The battery pack according to claim 1, wherein the reinforcing bracket includes a corrugated structure.

6. The battery pack according to any one of claims 1 to 5, wherein the lid includes a first base and a first raised portion further from the base plate than the first base.

7. The battery pack according to claim 6, wherein the reinforcing bracket includes a second base and a second raised portion further from the base plate than the second base.

8. The battery pack according to claim 7, wherein the second raised portion overlaps the first raised portion in a third direction perpendicular to the mounting surface of the base plate.

9. The battery pack according to claim 8, wherein two or more of the second raised portions overlap with one of the second raised portions in the third direction.

10. The battery pack according to claim 7, wherein the second raised portion is welded to the first raised portion.

11. The battery pack according to claim 7, wherein the second base is welded to the first base.

12. The battery pack according to claim 7, wherein the reinforcing bracket is welded to the first base of the lid and is separated from the first raised portion.

13. The battery pack according to claim 12, wherein the lid includes a wave-shaped structure that overlaps with the reinforcing bracket.

14. A pack housing including a base plate and side walls, A battery cell assembly disposed on the pack housing, wherein the battery cell assembly includes a plurality of battery cells and a first cross beam and a second cross beam spaced apart in a first direction with the plurality of battery cells in between, A lid attached to the side wall, A reinforcing bracket extending in the first direction and welded to the lid, Includes a battery pack.

15. The battery pack according to claim 14, wherein the reinforcing bracket is coupled to the first crossbeam and the second crossbeam.

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