Battery

Abstract

The invention relates to a battery pack. The battery pack comprises a battery pack housing consisting of a base plate and side panels; first and second crossbars arranged on the battery pack housing, and positioned apart in the first direction parallel to the mounting surface of the base plate and extending in the second direction parallel to the mounting surface of the base plate; a battery cell assembly placed between the first and second crossbars; conductors coupled to the side panels and covering the battery cell assembly; and reinforcing supports coupled to the conductors and extending in the first direction.

Description

battery pack

[0001] The present invention relates to a battery pack. This application claims the benefit of Korean Application No. 10-2023-0160100, filed November 20, 2023, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, including handsets, laptops, and cordless vacuum cleaners. Recently, improved energy density and economies of scale have dramatically reduced the per-unit manufacturing cost of secondary batteries. Furthermore, as the range of battery electric vehicles (BEVs) has increased to match that of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] The technological development trend in secondary batteries for mobility is improving energy density and safety. The energy density of a secondary battery is defined as the maximum electrical energy it can store divided by its mass. High energy density in secondary batteries is directly linked to driving efficiency and range in mobility, and therefore, various studies are being conducted to improve the energy density of secondary batteries.

[0004] The technical idea of ​​the present invention aims to solve a problem by providing a battery pack with improved safety.

[0005] According to exemplary embodiments for solving the above-described problem, a battery pack is provided. The battery pack includes: a pack housing including a base plate and side walls; first and second cross beams disposed on the pack housing and spaced apart in a first direction parallel to a 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 and second cross beams; 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.

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

[0007] The above reinforcing bracket is connected to the first and second cross beams.

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

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

[0010] The lead comprises a first base and a first raised portion further from the base plate than the first base.

[0011] The above reinforcing bracket includes a second base and second raised portions further from the base plate than the second base.

[0012] The second elevated portions overlap the first elevated portions 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 elevated portions overlap with one of the second elevated portions in the third direction.

[0014] The above second elevated portions are welded to the above first elevated portions.

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

[0016] The above reinforcing bracket is welded to the first base of the lead and is spaced apart from the first raised portion.

[0017] The above lead includes a corrugated structure overlapping the above reinforcing bracket.

[0018] According to exemplary embodiments, 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 and first and second cross beams spaced apart in a first direction with the plurality of battery cells interposed therebetween; a lead coupled to the side walls; and a reinforcing bracket extending in the first direction and welded to the lead.

[0019] The above reinforcing bracket is connected to the first and second cross beams.

[0020] A battery pack according to exemplary embodiments of the present invention may include a bracket welded to the lead. This prevents damage to the lead due to vibration of the battery pack and swelling of the battery cells.

[0021] The 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 those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0022] FIG. 1 is a plan view illustrating a battery pack according to exemplary embodiments.

[0023] Figure 2 is a cross-sectional view taken along the cutting line 1I-1I' of Figure 1.

[0024] Figure 3 is a cross-sectional view of the lead and reinforcing bracket.

[0025] FIG. 4 is a cross-sectional view illustrating a battery cell assembly according to other exemplary embodiments.

[0026] Figure 5 is a cross-sectional view of the lead and reinforcing bracket.

[0027] FIG. 6 is a plan view illustrating a battery pack according to other exemplary embodiments.

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0029] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0030] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0031] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0032]

[0033] (Example 1)

[0034] FIG. 1 is a plan view illustrating a battery pack (100) according to exemplary embodiments. In FIG. 1, the lead (160) is omitted for a more complete understanding of the positional relationship between elements of the battery pack (100).

[0035] Figure 2 is a cross-sectional view taken along the cutting line 1I-1I' of Figure 1.

[0036] Fig. 3 is a cross-sectional view of a lead (160) and a reinforcing bracket (150). More specifically, Fig. 3 corresponds to the section line 1II-1II' of Fig. 1.

[0037]

[0038] Referring to FIGS. 1 to 3, a battery pack (100) may include a pack housing (110), a plurality of battery cell assemblies (120), a center beam (131), cross beams (133), exhaust devices (140), reinforcing brackets (150), a lead (160), and fixtures (170). The battery pack (100) is the final form of a battery system mounted on mobility, etc.

[0039] The pack housing (110) may include a base plate (110B) and side walls (110S). Here, two directions substantially parallel to the mounting surface (110M) of the base plate (110B) are defined as the X direction and the Y direction, and a direction substantially perpendicular to the mounting surface (110M) of the base plate (110B) is defined as the Z direction. The X direction, the Y direction, and the Z direction may be substantially perpendicular to each other.

[0040] The base plate (110B) may have a flat shape. The side walls (110S) may be substantially perpendicular to the base plate (110B). The side walls (110S) may be adjacent to edge portions of the base plate (110B). The side walls (110S) may be joined to edge portions of the base plate (110B).

[0041] Each of the base plate (110B) and the side walls (110S) may be provided by an extrusion process. The base plate (110B) may include a plurality of plates joined by friction stir welding.

[0042] A plurality of battery cell assemblies (120) may be arranged on a mounting surface (110M) of a base plate (110B) of a pack housing (110). The battery cell assemblies (120) may be arranged in the X direction and the Y direction. 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, so that the plurality of battery cell assemblies (120) form a matrix of two rows and three columns. However, this is for illustrative purposes and does not limit the technical idea of ​​the present invention in any sense.

[0043] The base plate (110B) can support a plurality of battery cell assemblies (120). The side walls (110S) can horizontally surround the plurality of battery cell assemblies (120).

[0044] Hereinafter, the technical concept of the present invention will be described with reference to an embodiment in which the battery pack (100) is a modular type and each of the plurality of battery cell assemblies (120) does not include a module frame. However, this is a non-limiting example and does not limit the technical concept of the present invention in any sense. A person skilled in the art will easily be able to achieve a plurality of battery cell assemblies including a module frame and a module-type battery pack including the same based on the description herein.

[0045] Each of the plurality of battery cell assemblies (120) may include a plurality of battery cells (121) and separators (122). Each of the plurality of battery cells (121) may include an electrode assembly, an electrolyte, and a case.

[0046] Each of the plurality of battery cells (121) may be any one of a cylindrical battery cell, a square 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 square battery cell is housed in a square metal can. The electrode assembly of the pouch-type battery cell is housed in a pouch case including an aluminum laminate sheet.

[0047] The electrode assembly includes an anode, a cathode, and a separator interposed between the anode and the cathode. A jelly roll type electrode assembly is formed by winding an anode, a cathode, and a separator interposed between them. A stack type electrode assembly includes a plurality of sequentially stacked anodes, a plurality of cathodes, and a plurality of separators interposed between them.

[0048] According to exemplary embodiments, a plurality of battery cells (121) may constitute a plurality of banks. The plurality of banks may include one or more parallel-connected battery cells (121). The plurality of banks may be connected in series with each other. The number of battery cells (121) included in each of the plurality of banks and the number of banks connected in series with each other may be determined according to the voltage and current to be output through each of the plurality of battery cell assemblies (120).

[0049] According to exemplary embodiments, the cell stack may further include a plurality of separators (122). The plurality of separators (122) may prevent swelling of the plurality of battery cells (121) by horizontally supporting the plurality of battery cells (121). According to exemplary embodiments, the plurality of separators (122) may be thermal barriers. According to exemplary embodiments, each of the plurality of separators (122) may have a high melting temperature and low thermal conductivity. According to exemplary embodiments, each of the plurality of separators (122) may include a flame retardant material, such as a ceramic or coated glass material. According to exemplary embodiments, the plurality of separators (122) may also be configured to release a fire retardant material and a fire extinguishing agent when a thermal runaway event occurs.

[0050] The center beam (131) may be surrounded by side walls (110S). Accordingly, the center beam may divide the space defined by the pack housing (110). The center beam (131) may be included in one of the plurality of plates of the base plate (110B), formed by an extrusion process together with one of the plurality of plates, or may be welded to one of the plurality of plates of the base plate (110B).

[0051] The center beam (131) can extend along the X direction. The center beam (131) can isolate the battery cell assemblies (120) in the Y direction. The center beam (131) can be interposed between the battery cell assemblies (120).

[0052] The cross beams (133) can extend along the Y direction. The cross beams (133) can isolate a plurality of battery cell assemblies (120) in the X direction. The cross beams (133) can be interposed between the battery cell assemblies (120) in the X direction or between the battery cell assemblies (120) and the side walls (110S). The cross beams (133) can be interposed between the side walls (110S) and the center beam (131) in the Y direction.

[0053] The exhaust devices (140) may be coupled to any one of the side walls (110S). The side walls (110S) coupled to the exhaust devices (140) may include exhaust paths connected to the exhaust devices (140). The exhaust devices (140) may be configured to delay 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.

[0054] Here, thermal runaway of multiple battery cell assemblies (120) is a state in which temperature changes of multiple battery cell assemblies (120) further accelerate the temperature change, which is an uncontrollable positive feedback. Multiple battery cell assemblies (120) in a state of thermal runaway exhibit a rapid temperature increase and emit a large amount of high-pressure gas and combustion debris.

[0055] The lead (160) may be coupled to the side walls (110S). The lead may cover elements disposed within the battery pack (100), such as battery cell assemblies (120) and electrical components. The lead may be secured to the battery pack (100) by a mechanical fastening means, such as a bolt.

[0056] The reinforcing brackets (150) may extend in the X direction. Each of the reinforcing brackets (150) may overlap with a plurality of battery cell assemblies (120) in the Z direction. In this example, each of the reinforcing brackets (150) may overlap with each of the battery cell assemblies (120) arranged in the extending direction of each of the reinforcing brackets (150) in the Z direction. In FIG. 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 sense. A person skilled in the art will readily arrive at an embodiment in which each of the reinforcing brackets (150) overlaps with two or four or more battery cell assemblies based on the description herein.

[0057] According to exemplary embodiments, the reinforcing brackets (150) may overlap with a plurality of cross beams (133) in the Z direction. According to exemplary embodiments, the reinforcing brackets (150) may be coupled with a plurality of cross beams (133). In the example, each of the reinforcing brackets (150) may be coupled with a cross beam (133) arranged in the extension direction (i.e., the X direction) of each of the reinforcing brackets (150). In FIG. 1, each of the reinforcing brackets (150) is coupled with four cross beams (133), but this is for illustration only and does not limit the technical idea of ​​the present invention in any sense. A person skilled in the art will easily arrive at an embodiment in which each of the reinforcing brackets (150) is coupled with two or four or more cross beams based on the description herein.

[0058] The reinforcing brackets (150) can be connected to each of the cross beams (133) arranged in the X direction by means of fasteners (170). The fasteners (170) can be mechanical fastening means such as bolts, for example. In addition to the reinforcing brackets (150), the fasteners (170) can fasten the leads (160) to the cross beams (133).

[0059] Each of the reinforcing brackets (150) may include a base (151), raised portions (155) and connecting portions (153). Each of the reinforcing brackets (150) may include a Y-direction corrugated structure (CGS). The repetition of the base (151), raised portions (155) and connecting portions (153) may constitute the corrugated structure (CGS). The base (151), raised portions (155) and connecting portions (153) may be arranged in the Y-direction. That the reinforcing brackets (150) include a Y-direction corrugated structure (CGS) means that the Z-direction position of each portion of the reinforcing brackets (150) varies in a corrugated manner depending on the Y-direction position.

[0060] The raised portions (155) can be raised upward from the base (151). The distance between each of the raised portions (155) and the base plate (110B) can be different from the distance between the base (151) and the base plate (110B). The distance between each of the raised portions (155) and the base plate (110B) can be greater than the distance between the base (151) and the base plate (110B).

[0061] The connecting portions (153) can connect the base (151) and the raised portions (155). Each of the base (151) and the raised portions (155) can be substantially parallel to the mounting surface (110M) of the base plate (110B). Each of the connecting portions (153) can include either an inclined surface or a curved surface. Each of the connecting portions (153) can, for example, be slanted to the mounting surface (110M) of the base plate (110B).

[0062] The lead (160) may include a base (161), raised portions (165) and connecting portions (163). The base (161), raised portions (165) and connecting portions (163) may be arranged in the Y direction. In addition to the raised portions (165) and connecting portions (163) overlapping the reinforcing brackets (150), the lead (160) may further include additional raised portions and connecting portions.

[0063] Each of the raised portions (165) can be raised upward from the base (161). The distance between each of the raised portions (165) and the base plate (110B) can be different from the distance between the base (161) and the base plate (110B). The distance between each of the raised portions (165) and the base plate (110B) can be greater than the distance between the base (161) and the base plate (110B).

[0064] The connecting portions (163) can connect the base (161) and the raised portions (165). Each of the base (161) and the raised portions (165) can be substantially parallel to the mounting surface (110M) of the base plate (110B). Each of the connecting portions (163) can include either an inclined surface or a curved surface. Each of the connecting portions (163) can, for example, be slanted to the mounting surface (110M) of the base plate (110B).

[0065] The base (151) can overlap with the base (161) in the Z direction. The base (151) can be in contact with the base (161). The base (151) can be welded to the base (161). Accordingly, first welded portions (WP1) can be provided on the base (151) and the base (161). The first welded portions (WP1) can be formed, for example, by spot welding.

[0066] The raised portions (155) may overlap with the raised portions (165) in the Z direction. According to exemplary embodiments, a plurality (e.g., two or more) of the raised portions (155) may overlap with the raised portions (165) in the Z direction. The raised portions (155) may be in contact with the raised portions (165). The raised portions (155) may be welded with the raised portions (165). Accordingly, second weld portions (WP2) may be provided on the raised portions (155) and the raised portions (165). The second weld portions (WP2) may be formed, for example, by spot welding.

[0067] According to exemplary embodiments, the reinforcing brackets (150) may be coupled to the cross beams (133) and also coupled to the lid (160). The reinforcing brackets (150) may reinforce the rigidity of the lid (160), and structures may be provided to withstand uniform surface pressure on the upper and lower portions of the battery cell assembly (120) when the plurality of battery cells (121) swell. More specifically, a base plate (110B) having high mechanical rigidity may be provided below the battery cell assembly (120), and a coupling structure of the reinforcing brackets (150) and the lid (160) may be provided above the battery cell assembly (120). Accordingly, the lid (160) may be prevented from being damaged when the plurality of battery cells (121) swell, and the pressure distribution around the battery cell assembly (120) may be uniform.

[0068] The battery pack (100) may further include inter-busbars. A plurality of battery cell assemblies (120) may be connected in series by the inter-busbars, and the battery pack (100) may output a high voltage.

[0069] The battery pack (100) may further include electrical components. The electrical components may be positioned on the pack housing (110). The electrical components may be positioned between one of the side walls (110S) on which the exhaust devices (140) are installed and the plurality of battery cell assemblies (120).

[0070] The electrical components may include, for example, a BMS. The BMS may be configured to monitor, balance, and control the battery pack. Monitoring of the battery pack (100) may include measuring voltage and current of specific nodes within a plurality of battery cell assemblies (120) and measuring temperature of set locations within the battery pack (100). The battery pack (100) may include sensors for measuring the voltage, current, and temperature described above.

[0071] Balancing of a battery pack (100) is an operation that reduces the deviation between multiple battery cell assemblies (120). Control of the battery pack (100) includes preventing overcharge, overdischarge, 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).

[0072] The electrical components may further include a cooling device, a PRA (Power Relay Assembly), a safety plug, etc. 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 power supply to the external load (e.g., a vehicle motor) in a situation where an abnormal voltage, such as a voltage surge, occurs.

[0073]

[0074] (Example 2)

[0075] FIG. 4 is a cross-sectional view illustrating a battery cell assembly (120') according to other exemplary embodiments.

[0076] Referring to FIG. 4, the battery cell assembly (120') may include a plurality of battery cells (121), separators (122), and first and second cross beams (125A, 125B). In FIG. 4, the battery cells (121), separators (122), base plate (110B), reinforcing bracket (150), lead (160), and fixing members (170) are substantially the same as those described with reference to FIGS. 1 to 3, and therefore, a redundant description thereof will be omitted.

[0077] The first and second cross beams (125A, 125B) may be spaced apart from each other with a plurality of battery cells (121) therebetween. The first and second cross beams (125A, 125B) may be coupled to the plurality of battery cells (121) using, for example, an adhesive or the like. The first and second cross beams (125A, 125B) may have different and complementary shapes. Accordingly, the first cross beam (125A) of each battery cell assembly (120') may be coupled to the second cross beam (125B) of the preceding battery cell assembly (120'), and the second cross beam (125B) of each battery cell assembly (120') may be coupled to the first cross beam (125A) of the subsequent battery cell assembly (120'). There may be a clearance between the first and second cross beams (125A, 125B) coupled to each other, taking manufacturing tolerances into account.

[0078] Each of the plurality of battery cell assemblies (120) of FIGS. 1 and 2 may be replaced by a battery cell assembly (120'), and the cross beams (133) may be omitted. Accordingly, the reinforcing bracket (150) may be coupled to the first and second cross beams (125A, 125B) of the battery cell assembly (120') by the fasteners (170).

[0079]

[0080] (Example 3)

[0081] Figure 5 is a cross-sectional view of a lead (160') and a reinforcing bracket (150').

[0082] Referring to FIG. 5, the reinforcing bracket (150') may be substantially flat. The reinforcing bracket (150') may include a flat plate shape. The reinforcing bracket (150') may not include a corrugated structure. The reinforcing bracket (150') may replace the reinforcing bracket (150) of FIG. 3.

[0083] In this example, the shape of the lead (160') may also be changed according to the shape change of the reinforcing bracket (150'). More specifically, the lead (160') may include a corrugated structure (CGS') that overlaps the reinforcing bracket (150'). The repetition of the base (161'), the raised portions (165') and the connecting portions (163) may constitute the corrugated structure (CGS'). The base (161'), the raised portions (165') and the connecting portions (153) may be arranged in the Y direction. The lead (160') may include an increased number of raised portions (165') and connecting portions (153) compared to the lead of FIG. 3. The reinforcing bracket (150') may overlap two or more raised portions (165') in the Z direction.

[0084] According to exemplary embodiments, the reinforcing bracket (150') has a flat shape, such that the reinforcing bracket (150') can be spaced apart from the raised portions (165') of the lead (160').

[0085] The reinforcing bracket (150') and the base (161') of the lead (160') can be joined, for example, by spot welding. First welded portions (PW1) can be provided at the base (161') of the reinforcing bracket (150') and the lead (160').

[0086]

[0087] (Example 4)

[0088] FIG. 6 is a plan view showing a battery pack (101) according to other exemplary embodiments.

[0089] The battery pack (101) may include a pack housing (110), a plurality of battery cell assemblies (120), a center beam (131), cross beams (133), exhaust devices (140), reinforcing brackets (150"), a lead (160), and fixtures (170). The battery pack (101) is the final form of a battery system mounted on a mobility device, etc.

[0090] The reinforcing brackets (150") are substantially the same as the reinforcing brackets (150) described with reference to FIGS. 1 to 3, except for the length in the X direction and the resulting connection with the cross beams (133).

[0091] In this example, the reinforcing brackets (150") may have a reduced length compared to the reinforcing brackets (150) of FIG. 1. Each of the reinforcing brackets (150") may overlap a corresponding one of the plurality of battery cell assemblies (120) in the Z direction. Each of the reinforcing brackets (150") may overlap one battery cell assembly (120) in the Z direction. Each of the reinforcing brackets (150") may be coupled to two adjacent cross beams (133). In FIG. 6, four cross beams (133) are arranged in the X direction, and three reinforcing brackets (150") may be coupled to adjacent ones of the four cross beams (133).

[0092]

[0093] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. Pack housing including base plate and side walls; First and second cross beams arranged 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 and second cross beams; a lead coupled to said side walls and covering said battery cell assembly; and A battery pack comprising a reinforcing bracket coupled to the lead and extending along the first direction.

2. In paragraph 1, A battery pack, characterized in that the reinforcing bracket is connected to the lead by spot welding.

3. In paragraph 1, A battery pack, characterized in that the reinforcing bracket is connected to the first and second cross beams.

4. In paragraph 1, A battery pack, characterized in that the above reinforcing bracket has a flat shape.

5. In paragraph 1, A battery pack, characterized in that the above reinforcing bracket includes a wrinkled structure.

6. In paragraph 1, A battery pack characterized in that the lead includes a first base and a first raised portion further from the base plate than the first base.

7. In paragraph 6, A battery pack, wherein the reinforcing bracket comprises a second base and second raised portions further from the base plate than the second base.

8. In paragraph 7, A battery pack characterized in that the second elevated portions overlap the first elevated portions in a third direction perpendicular to the mounting surface of the base plate.

9. In paragraph 8, A battery pack characterized in that two or more of the second elevated portions overlap one of the second elevated portions in the third direction.

10. In paragraph 7, A battery pack characterized in that the second elevated portions are welded to the first elevated portions.

11. In paragraph 7, A battery pack, characterized in that the second base is welded to the first base.

12. In paragraph 7, A battery pack, characterized in that the reinforcing bracket is welded to the first base of the lead and spaced apart from the first raised portion.

13. In paragraph 12, A battery pack, characterized in that the lead includes a wrinkled structure overlapping the reinforcing bracket.

14. Pack housing including 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 first and second cross beams spaced apart in a first direction with the plurality of battery cells interposed therebetween; leads coupled to the side walls; and A battery pack comprising a reinforcing bracket extending in the first direction and welded to the lead.

15. In paragraph 14, A battery pack, characterized in that the reinforcing bracket is connected to the first and second cross beams.

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