Pack housing and manufacturing method thereof

Abstract

Provided is a pack housing according to exemplary embodiments. The pack housing comprises: a center plate; side plates coupled to the center plate; and side beams attached to the side plates, wherein each side plate comprises a reinforcement bead extending in a first direction, the first direction being parallel to the mount surfaces of the side plates.

Description

Pack housing and method of manufacturing the same

[0001] The present invention relates to a pack housing for use in a battery pack and a method for manufacturing the same. This application claims the benefit of Korean Application No. 10-2023-0119029, filed September 7, 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 for secondary batteries for mobility is improving energy density and safety. The safety of secondary batteries for mobility is crucial, as it directly impacts the lives of passengers. Safety in secondary batteries can be achieved through mechanical robustness, reliable electrical insulation, and delayed heat transfer in the event of thermal runaway.

[0004] The technical idea of ​​the present invention is to provide a pack housing with improved reliability and mechanical robustness and a method for manufacturing the same.

[0005] According to exemplary embodiments of the present invention for solving the above-described problem, a pack housing is provided. The pack housing comprises: a center plate; side plates coupled to the center plate; and side beams coupled to the side plates, wherein each of the side plates includes a reinforcing bead extending in a first direction, the first direction being parallel to a mounting surface of each of the side plates.

[0006] Each of the side plates includes a lower surface opposite the mounting surface, and the reinforcing bead of each of the side plates is on the lower surface of each of the side plates.

[0007] The reinforcing beads of each of the above side plates are hollow.

[0008] The reinforcing beads of each of the above side plates are hollow.

[0009] The center plate includes a center reinforcing bead extending in the first direction.

[0010] The center plate includes a center beam extending in the first direction.

[0011] The above side plates are spaced apart in a second direction perpendicular to the first direction with the center plate interposed therebetween.

[0012] The height of the above reinforcing bead is in the range of 0.1 mm to 10 mm.

[0013] According to exemplary embodiments, a method of manufacturing a pack housing is provided. The method comprises the steps of: extruding a center plate, side plates, and side walls; aligning the center plate, the side plates, and the side walls, wherein the side plates are spaced apart from each other with the center plate therebetween, and the side walls are spaced apart from each other with the center plate and the side plates therebetween; joining a reinforcing structure to the side walls; and welding the center plate, the side plates, and the side walls.

[0014] Each of the side plates includes a reinforcing bead extending in the first direction, and the reinforcing bead of each of the side plates is formed by extrusion of the side plates.

[0015] The above reinforcing structure is perpendicular to the extrusion direction of the center plate, the side plates and the side walls.

[0016] The above reinforcing structure is joined to the side walls by bolting.

[0017] The above reinforcing structure is joined to the side walls by welding.

[0018] It further comprises a step of separating the above reinforcing structure from the side walls.

[0019] According to exemplary embodiments of the present invention, warping of the center plate, side plates, and side walls of the pack housing can be prevented during welding. Accordingly, the mechanical robustness and reliability of the pack housing can be improved.

[0020] 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.

[0021] FIG. 1 is a perspective view of a pack housing according to exemplary embodiments.

[0022] Figure 2 is a perspective view of a pack housing according to exemplary embodiments.

[0023] Figure 3 is a cross-sectional view taken along the cutting line 1I-1I' of Figure 1.

[0024] FIG. 4 is a plan view of a battery pack according to exemplary embodiments.

[0025] FIG. 5 is a cross-sectional view of a pack housing according to other exemplary embodiments.

[0026] Figure 6 is a cross-sectional view of a pack housing according to other exemplary embodiments.

[0027] Figure 7 is a cross-sectional view of a pack housing according to other exemplary embodiments.

[0028] FIG. 8 is a flowchart illustrating a method for manufacturing a pack housing according to exemplary embodiments.

[0029] FIG. 9 is a cross-sectional view illustrating a method of manufacturing a pack housing according to exemplary embodiments.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034]

[0035] (Example 1)

[0036] FIG. 1 is a perspective view of a pack housing (110) according to exemplary embodiments.

[0037] FIG. 2 is a perspective view of a pack housing (110) according to exemplary embodiments.

[0038] Figure 3 is a cross-sectional view taken along the cutting line 1I-1I' of Figure 1.

[0039] Referring to FIGS. 1 to 3, the pack housing (110) can provide a space for mounting battery cell assemblies (120, see FIG. 4) to be described later. The pack housing (110) can include a center plate (111), side plates (112, 113, 114, 115), and side walls (116, 117). The battery cell assemblies (120, see FIG. 4) can be placed on mounting surfaces (111M, 112M, 113M, 114M, 115M) of the center plate (111) and side plates (112, 113, 114, 115).

[0040] Two directions substantially parallel to the mounting surfaces (111M, 112M, 113M, 114M, 115M) of the center plate (111) and the side plates (112, 113, 114, 115) are defined as the X direction and the Y direction, and a direction substantially perpendicular to the mounting surfaces (111M, 112M, 113M, 114M, 115M) of the center plate (111) and the side plates (112, 113, 114, 115) is defined as the Z direction. Each of the X direction, the Y direction, and the Z direction can be substantially perpendicular to each other. Unless otherwise stated, the definitions of directions are the same for the drawings below.

[0041] Each of the center plate (111) and the side plates (112, 113, 114, 115) can be provided by an extrusion process. The extrusion direction of each of the center plate (111) and the side plates (112, 113, 114, 115) can be the X direction. The center plate (111) and the side plates (112, 113, 114, 115) can be arranged in the Y direction.

[0042] The center plate (111) may be interposed between the side plates (112, 113) and the side plates (114, 115). In FIGS. 1 to 5, four side plates (112, 113, 114, 115) and the center plate (111) interposed between them are illustrated, but this is a non-limiting example and does not limit the technical idea of ​​the present invention in any sense. The number of side plates (112, 113, 114, 115) may be changed depending on the design of the battery pack (100, see FIG. 6) to be ultimately manufactured.

[0043] The center plate (111) and the side plates (112, 113, 114, 115) can be joined to each other. The center plate (111) and the side plates (112, 113, 114, 115) can be joined by, for example, friction stir welding. Accordingly, the center plate (111) and the side plates (112, 113, 114, 115) can have welding surfaces therebetween.

[0044] However, it is not limited thereto, and the center plate (111) and side plates (112, 113, 114, 115) may be joined by methods such as arc welding, laser welding, electron beam welding, friction welding, and ultrasonic welding.

[0045] Each of the center plate (111) and the side plates (112, 113, 114, 115) may include cooling channels (CH), cavities (CVT) and ribs. Each of the cooling channels (CH), cavities (CVT) and ribs may extend in the extrusion direction (i.e., X direction).

[0046] Cooling channels (CH) can provide a path for cooling fluid to flow. The cooling channels can be spaced apart in the Y direction. The cooling channels can be arranged along the Y direction.

[0047] The cavities (CVT) are empty spaces formed inside the center plate (111) and the side plates (112, 113, 114, 115). Due to the formation of the cavities (CVT), the mass of the center plate (111) and the side plates (112, 113, 114, 115) can be reduced, and thus the energy density of the battery pack (100, see FIG. 6) including the pack housing (110) can be increased.

[0048] The ribs can define cooling channels (CH) and cavities (CVT). The ribs can surround the cooling channels (CH) and cavities (CVT). The ribs can maintain the airtightness of the cooling channels (CH) and cavities (CVT).

[0049] The center plate (111) may include a center beam (CB). The center beam (CB) may protrude from the mounting surface (111M) of the center plate (111). The center beam (CB) may extend in the X direction.

[0050] Each of the side plates (112, 113, 114, 115) may include reinforcing beads (REB). Each of the reinforcing beads (REB) of each of the side plates (112, 113, 114, 115) may extend in the X direction. The length of each of the reinforcing beads (REB) of each of the side plates (112, 113, 114, 115) may be substantially the same as the length of each of the side plates (112, 113, 114, 115).

[0051] The reinforcing beads (REB) of each of the side plates (112, 113, 114, 115) may be on the lower surfaces (112B, 113B, 114B, 115B) of the side plates (112, 113, 114, 115). The reinforcing beads (REB) of each of the side plates (112, 113, 114, 115) may protrude from the lower surfaces (112B, 113B, 114B, 115B) of the side plates (112, 113, 114, 115). The lower surfaces (112B) may be opposite to the mounting surface (112M). The lower surfaces (113B) may be opposite to the mounting surface (113M). The lower surface (114B) may be the opposite of the actual surface (114M). The lower surface (115B) may be the opposite of the actual surface (115M).

[0052] In this example, the reinforcing beads (REB) may be solid. Accordingly, the height of the reinforcing beads (REB) can be minimized, and the energy density of the battery pack (100, see FIG. 4) including the pack housing (110) can be increased. According to exemplary embodiments, the height of each reinforcing bead (REB) may be in a range of about 0.1 mm to about 10 mm. According to exemplary embodiments, the height of each reinforcing bead (REB) may be about 0.5 mm or more. According to exemplary embodiments, the height of each reinforcing bead (REB) may be about 5 mm or less. According to exemplary embodiments, the height of each reinforcing bead (REB) may be about 3 mm or less.

[0053] Furthermore, when the cover plate is coupled under the pack housing (110) (i.e., on the lower surface (112B, 113B, 114B, 115B) of the side plates (112, 113, 114, 115)), interference between the reinforcing beads (REB) and the cover plate can be prevented.

[0054] According to exemplary embodiments, each of the side plates (112, 113, 114, 115) can be prevented from bending in the X direction by the reinforcing beads (REB), thereby improving the mechanical robustness and reliability of the pack housing (110).

[0055] The side wall (116) may be provided by an extrusion process. Accordingly, the side wall (116) may include cooling channels and cavities. The side wall (116) may include a plate portion (116P), a side wall portion (116SW), and a wing portion (116W). The side wall portion (116SW) may be substantially perpendicular to the plate portion (116P). The wing portion (116W) may be on the outside of the side wall portion (116SW). The wing portion (116W) may include a plurality of coupling holes. The wing portion (116W) may be used for transporting the pack housing (110), or for securing (e.g., securing the pack housing (110) to a vehicle or other battery tray) and transporting the pack housing (100, see FIG. 4).

[0056] The side wall (117) may be provided by an extrusion process. Accordingly, the side wall (117) may include cooling channels and cavities. The side wall (117) may include a plate portion (117P), a side wall portion (117SW), and a wing portion (117W). The plate portions (116P 117P) may form a base plate of the pack housing (110) together with the center plate (111) and the side plates (112, 113, 114, 115). The side wall portion (117SW) may be substantially perpendicular to the plate portion (117P). The wing portion (117W) may be on the outside of the side wall portion (117SW). The wing portion (117W) may include a plurality of joining holes. The wing portion (117W) may be used for transporting the pack housing (110) or for securing (e.g., securing the pack housing (110) to a vehicle or other battery tray) and transporting the pack housing (100, see FIG. 4).

[0057]

[0058]

[0059] (Example 2)

[0060] FIG. 4 is a plan view of a battery pack according to exemplary embodiments.

[0061] Referring to FIGS. 1 to 4, a battery pack (100) may include a pack housing (110) and a plurality of battery cell assemblies (120).

[0062] The pack housing (110) is substantially the same as that described with reference to FIGS. 1 to 3. A plurality of battery cell assemblies (120) may be arranged on a center plate (111) and side plates (112, 113, 114, 115) of the pack housing (110). The center plate (111) and side plates (112, 113, 114, 115) may support the plurality of battery cell assemblies (120). The side walls (116, 117) and additional side walls may horizontally surround the plurality of battery cell assemblies (120). The side walls (116, 117) and additional side walls may protect the plurality of battery cell assemblies (120).

[0063] For example, the battery pack (100) may be of a modular type, and each of the plurality of battery cell assemblies (120) may not include a module frame. As another example, the battery pack (100) may be of a modular type, and each of the plurality of battery cell assemblies (120) may include a module frame.

[0064] Each of the plurality of battery cell assemblies (120) may include a plurality of banks connected in series with each other. Each of the plurality of banks may include one or more parallel-connected battery cells. The number of series-connected banks and the number of parallel-connected battery cells may be determined depending on the magnitude of the voltage and current to be output from each of the battery cell assemblies (120).

[0065] A plurality of battery cells are the basic units of a lithium-ion battery, i.e., a secondary battery. Each of the plurality of battery cells includes an electrode assembly, an electrolyte, and a case. Each of the plurality of battery cells may be any one of a cylindrical battery cell, a prismatic battery cell, and a pouch-type battery cell. The electrode assembly of the cylindrical battery cell is housed in a cylindrical metal can. The electrode assembly of the prismatic battery cell is housed in a prismatic metal can. The electrode assembly of the pouch-type battery cell is housed in a pouch case including an aluminum laminate sheet.

[0066] The electrode assembly may include an anode, a cathode, and a separator interposed between the anode and the cathode. The electrode assembly may be either a jelly-roll type or a stack type. The jelly-roll type electrode assembly may include a winding structure of the anode, the cathode, and the separator interposed therebetween. The stack type electrode assembly may include a plurality of sequentially stacked anodes, a plurality of cathodes, and a plurality of separators interposed therebetween.

[0067] A plurality of battery cell assemblies (120) can be arranged in the X direction and the Y direction. In FIG. 1, the number of the plurality of battery cell assemblies (120) arranged in the X direction is three, and the number of the plurality of battery cell assemblies (120) arranged in the Y direction is two. Therefore, the arrangement of the plurality of battery cell assemblies (120) can be said to be a 3 * 2 arrangement. A person skilled in the art will be able to easily arrive at a plurality of battery cell assemblies (120) arranged in M ​​* N (wherein, M and N are each integers greater than or equal to 2) based on the description herein.

[0068] A center beam (CB) can isolate a plurality of battery cell assemblies (120) in the Y direction. The center beam (CB) can be interposed between the plurality of battery cell assemblies (120). According to exemplary embodiments, the battery pack (100) may further include cross beams that isolate the plurality of battery cell assemblies (120) in the X direction.

[0069] The arrangement of the center beam (CB) and the plurality of battery cell assemblies (120) disclosed in FIG. 1 is a non-limiting example and does not limit the technical concept of the present invention in any way. Those skilled in the art will readily be able to devise battery packs comprising various arrangements and numbers of center beams, cross beams, and battery cell assemblies based on the description herein.

[0070] The battery pack (100) may further include an exhaust device. The exhaust device may be configured to delay thermal propagation by releasing high-temperature gas within 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.

[0071] 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.

[0072] The battery pack (100) may further include electrical components. The electrical components may be mounted on the pack housing (110). The electrical components may include any electronic components necessary to operate the battery pack.

[0073] The electrical components may include, for example, a Battery Management System (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 measuring instruments for measuring the voltage, current, and temperature described above.

[0074] 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).

[0075] 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.

[0076] The battery pack (100) may further include a plurality of bus bars 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 bus bars. Accordingly, the battery pack (100) may be configured to output a high voltage to an external load (e.g., a vehicle motor).

[0077] The battery pack (100) may further include a lead plate coupled to the side walls (116, 117) and additional side walls. The lead plate may cover elements mounted within the battery pack (100), such as battery cell assemblies (120) and electrical components. The lead plate may be secured to the battery pack (100) by a mechanical fastening means, such as a fastening member.

[0078]

[0079] (Example 3)

[0080] FIG. 5 is a cross-sectional view of a pack housing (110') according to other exemplary embodiments.

[0081] Referring to FIG. 5, the pack housing (110') may include a center plate (111'), side plates (112, 113, 114, 115), and side walls (116, 117). The side plates (112, 113, 114, 115) and side walls (116, 117) are substantially the same as those described with reference to FIGS. 1 to 3, and therefore, a duplicate description thereof will be omitted.

[0082] Unlike the center plate (111) of FIGS. 1 to 3, the center plate (111') may further include reinforcing beads (REB). Accordingly, the bending resistance of the center plate (111') may be improved, and the mechanical robustness and reliability of the pack housing (110') may be improved. In FIG. 5, the reinforcing beads (REB) of the center plate (111') are solid, but unlike the drawing, the reinforcing beads (REB) of the center plate (111') may be hollow.

[0083]

[0084] (Example 4)

[0085] FIG. 6 is a cross-sectional view of a pack housing (110") according to other exemplary embodiments. Referring to FIG. 6, the pack housing (110") may include a center plate (111), side plates (112', 113', 114', 115'), and side walls (116, 117). The center plate (111) and side walls (116, 117) are substantially the same as those described with reference to FIGS. 1 to 3, and therefore, a redundant description thereof will be omitted.

[0086] The side plates (112', 113', 114', 115') may be substantially the same as the side plates (112, 113, 114, 115) of FIGS. 1 to 3, except for the reinforcing beads (REB'). Each of the side plates (112', 113', 114', 115') may include the reinforcing beads (REB'). Each of the reinforcing beads (REB') may extend in the X-direction. Each of the reinforcing beads (REB') may include a cavity. Each of the reinforcing beads (REB') may be hollow. Accordingly, the mechanical strength of the side plates (112', 113', 114', 115') can be secured, while the energy density of the battery pack including the side plates (112', 113', 114', 115') can be increased by reducing the weight of the reinforcing beads (REB').

[0087] The cavity within the reinforcing beads (REB') may not be for the flow of cooling fluid. The cavity within the reinforcing beads (REB') may not be connected to a cooling fluid supply device. The cavity within the reinforcing beads (REB') may be isolated from the cooling fluid supply device. The cavity within the reinforcing beads (REB') may have a different shape from the cooling channels (CH). For example, the cooling channels (CH) may have a circular cross-section, and the cavity within the reinforcing beads (REB') may have a rectangular cross-section.

[0088]

[0089] (Example 5)

[0090] FIG. 7 is a cross-sectional view of a pack housing (110'") according to other exemplary embodiments.

[0091] Referring to FIG. 7, the pack housing (110'") may include a center plate (111), side plates (112, 113, 114, 115), side walls (116, 117), and a reinforcing structure (118). The center plate (111), side plates (112, 113, 114, 115), and side walls (116, 117) are substantially the same as those described with reference to FIGS. 1 to 3, and therefore, a duplicate description thereof will be omitted.

[0092] According to exemplary embodiments, a reinforcing structure (118) may be coupled to the side walls (116, 117). The reinforcing structure (118) may have a generally rod-shaped shape. The reinforcing structure (118) may extend in the Y direction.

[0093] According to exemplary embodiments, the reinforcing structure (118) may be joined to the side walls (116, 117) by welding. According to other exemplary embodiments, the reinforcing structure (118) may be joined to the side walls (116, 117) by bolting. The reinforcing structure (118) may include a rod portion and a leg portion. The rod portion of the reinforcing structure (118) may be substantially parallel to the Y direction, and the leg portion of the reinforcing structure (118) may be substantially parallel to the Z direction.

[0094] According to exemplary embodiments, the Y-direction bending of the center plate (111) and the side plates (112, 113, 114, 115) can be prevented by the reinforcing structure (118), and thus, the mechanical robustness and reliability of the pack housing (110'") can be improved.

[0095]

[0096] (Example 6)

[0097] FIG. 8 is a flowchart illustrating a method for manufacturing a pack housing (110, see FIG. 1) according to exemplary embodiments.

[0098] FIG. 9 is a cross-sectional view illustrating a method of manufacturing a pack housing (110, see FIG. 1) according to exemplary embodiments.

[0099] Referring to FIGS. 2, 3 and 8, in P110, the center plate (111), side plates (112, 113, 114, 115) and side walls (116, 117) can be extruded. Since the center plate (111), side plates (112, 113, 114, 115) and side walls (116, 117) are provided through an extrusion process, they can have a relatively long length (e.g., X-direction length) and a constant cross-section (e.g., YZ cross-section) along the X direction. However, the present invention is not limited thereto, and the center plate (111), side plates (112, 113, 114, 115) and side walls (116, 117) may be mechanically machined, and the center plate (111), side plates (112, 113, 114, 115) and side walls (116, 117) may have variable cross-sections. For example, the center plate (111), side plates (112, 113, 114, 115) and side walls (116, 117) may include a first portion having a constant cross-section and a second portion having a variable cross-section.

[0100] Accordingly, the cross-section perpendicular to the X direction (i.e., on the YZ plane) of each of the center plate (111), side plates (112, 113, 114, 115), and side walls (116, 117) can be constant. By the extrusion process, channels (CH) and cavities (CVT) of the center plate (111), side plates (112, 113, 114, 115) can be formed.

[0101] Reinforcing beams (REB) may also be formed in the extrusion process of the center plate (111) and the side plates (112, 113, 114, 115). Accordingly, each of the reinforcing beams (REB) may be substantially parallel to the X direction, which is the extrusion direction of the center plate (111) and the side plates (112, 113, 114, 115).

[0102] Next, in P120, the center plate (111), the side plates (112, 113, 114, 115), and the side walls (116, 117) can be aligned. The alignment of the center plate (111), the side plates (112, 113, 114, 115), and the side walls (116, 117) may include placing the center plate (111) in the center of the side plates (112, 113, 114, 115), and placing the center plate (111), the side plates (112, 113, 114, 115) between the side walls (116, 117), and fixing them using a fixing means such as a jig.

[0103] Referring to FIGS. 8 and 9, at P130, reinforcing structures (118) can be joined to the side walls (116, 117). The reinforcing structures (118) can be joined to the side walls (116, 117) by bolting and / or welding.

[0104] Next, at P140, the center plate (111), the side plates (112, 113, 114, 115) and the side walls (116, 117) can be welded. According to exemplary embodiments, while the center plate (111), the side plates (112, 113, 114, 115) and the side walls (116, 117) are being welded, the center plate (111), the side plates (112, 113, 114, 115) and the side walls (116, 117) can be supported by the reinforcing beads (REB) and the reinforcing structures (118), and thus, bending of the center plate (111), the side plates (112, 113, 114, 115) and the side walls (116, 117) can be prevented.

[0105] Next, at P150, the reinforcing structures (118) can be separated from the side walls (116, 117). The reinforcing structures (118) can be separated by applying physical force or unbolting, etc. In some cases, the separation of the reinforcing structures (118) may be omitted.

[0106] 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. Center plate; Side plates coupled to the center plate; and Including side beams coupled to the above side plates, A pack housing, wherein each of the side plates includes a reinforcing bead extending in a first direction, the first direction being parallel to a mounting surface of each of the side plates.

2. In paragraph 1, Each of the above side plates includes a lower surface opposite to the mounting surface, and A pack housing, characterized in that the reinforcing beads of each of the side plates are on the lower surface of each of the side plates.

3. In paragraph 1, A pack housing characterized in that the reinforcing beads of each of the side plates are solid.

4. In paragraph 1, A pack housing characterized in that the reinforcing beads of each of the side plates are hollow.

5. In paragraph 1, A pack housing, characterized in that the center plate includes a center reinforcing bead extending in the first direction.

6. In paragraph 1, A pack housing, characterized in that the center plate includes a center beam extending in the first direction.

7. In paragraph 1, A pack housing characterized in that the side plates are spaced apart in a second direction perpendicular to the first direction with the center plate interposed therebetween.

8. In paragraph 1, A pack housing characterized in that the height of the reinforcing bead is in the range of 0.1 mm to 10 mm.

9. Step of extruding the center plate, side plates and side walls; A step of aligning the center plate, the side plates and the side walls, wherein the side plates are spaced apart from each other with the center plate therebetween, and the side walls are spaced apart from each other with the center plate and the side plates therebetween; a step of joining a reinforcing structure to the above side walls; and A method for manufacturing a pack housing, comprising the step of welding the center plate, the side plates and the side walls.

10. In paragraph 9, Each of the above side plates includes a reinforcing bead extending in the first direction, and A method for manufacturing a pack housing, characterized in that the reinforcing beads of each of the side plates are formed by extrusion of the side plates.

11. In paragraph 9, A method for manufacturing a pack housing, wherein the reinforcing structure is perpendicular to the extrusion direction of the center plate, the side plates, and the side walls.

12. In paragraph 9, A method for manufacturing a pack housing, characterized in that the reinforcing structure is joined to the side walls by bolting.

13. In paragraph 9, A method for manufacturing a pack housing, characterized in that the reinforcing structure is joined to the side walls by welding.

14. In paragraph 9, A method of manufacturing a pack housing further comprising the step of separating the reinforcing structure from the side walls.

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