Pack lead and battery pack comprising same

Abstract

According to exemplary embodiments of the present invention, a pack lead can be provided. The pack lead comprises: a center portion extending in a first direction and a second direction, which intersects the first direction; and a first edge portion, which is arranged with the center portion in the second direction and extends in the first direction. The first edge portion comprises: a first reinforcing portion connected to the center portion; and a first side portion extending from the first reinforcing portion in a third direction, which intersects each of the first direction and the second direction, wherein the thickness of the first reinforcing portion can be different from the thickness of the center portion.

Description

Pack lead and battery pack including the same

[0001] The present invention relates to a pack lead and a battery pack including the same.

[0002] This application claims the benefit of Korean application No. 10-2025-0011513, filed on January 24, 2025, which is incorporated herein by reference in its entirety.

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0004] The trend in the technological development of rechargeable batteries for mobility is the improvement of energy density and safety. The safety of rechargeable batteries is critical as it is directly linked to the lives of passengers. The safety of rechargeable batteries can be achieved through mechanical robustness, the reliability of electrical insulation, and the delay of heat transfer in the event of a thermal runaway event.

[0005] The problem that the technical concept of the present invention aims to solve is to provide a pack lead with improved performance and reliability.

[0006] The problem that the technical concept of the present invention aims to solve is to provide a pack lid with enhanced safety.

[0007] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with improved performance and reliability.

[0008] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with enhanced safety.

[0009] According to exemplary embodiments of the present invention for solving the above-described problem, a pack lead may be provided. The pack lead comprises: a central portion extending in a first direction and a second direction intersecting the first direction; and a first edge portion arranged in the central portion and the second direction and extending in the first direction, wherein the first edge portion comprises a first reinforcing portion connected to the central portion and a first side portion extending from the first reinforcing portion in a third direction intersecting the first direction and the second direction, respectively, and the thickness of the first reinforcing portion may be different from the thickness of the central portion.

[0010] In one embodiment, the thickness of the first reinforcing part may be greater than the thickness of the center.

[0011] In one embodiment, the first side portion may overlap the first reinforcing portion in the second direction.

[0012] In one embodiment, the first reinforcing member may include a portion parallel to the center.

[0013] In one embodiment, the third-direction thickness of the first reinforcing member may be three times the third-direction thickness of the center.

[0014] In one embodiment, the first reinforcing member may include a portion that intersects the center.

[0015] In one embodiment, the first reinforcing member may include an L-shape.

[0016] In one embodiment, the structure further includes a second edge portion that is arranged in the first direction and extends in the second direction, wherein the second edge portion includes a second reinforcing portion connected to the center and a second side portion extending in the third direction from the second reinforcing portion, and the thickness of the second reinforcing portion may be greater than the thickness of the center.

[0017] According to exemplary embodiments of the present invention for solving the above-described problem, a battery pack may be provided. The battery pack comprises: a housing; a plurality of battery cell assemblies surrounded by a side frame on a base plate; and a pack lead coupled to the side frame on the plurality of battery cell assemblies, wherein the pack lead comprises a center and an edge portion, the edge portion comprises a reinforcing portion connected to the center and a side portion extending from the reinforcing portion in a direction intersecting the reinforcing portion, the thickness of the center and the reinforcing portion are different from each other, and the side portion may overlap with the side frame.

[0018] In one embodiment, the center and the edge portion may be arranged in a first direction, the edge portion extends in a second direction intersecting the first direction, and the side portion overlaps the side frame in the first direction.

[0019] In one embodiment, the reinforcing member may overlap the side frame and the third direction intersecting the first direction and the second direction, respectively.

[0020] In one embodiment, the thickness of the reinforcing part may be greater than the thickness of the center.

[0021] In one embodiment, the edge portion extends in a first direction, and the side portion may overlap the reinforcing portion in a second direction that intersects the first direction.

[0022] In one embodiment, a gasket is disposed between the reinforcing member and the side frame, and the side member may overlap with the gasket in the second direction.

[0023] In one embodiment, the reinforcing member may include a portion that intersects with the center.

[0024] According to exemplary embodiments of the present invention, a battery pack may include a pack lid comprising edge portions. The edge portions may include a reinforcing portion having a thickness greater than that of the center, thereby increasing the fastening strength with the side frame of the pack lid. Additionally, the edge portions may include a side portion extending from the reinforcing portion, thereby preventing the leakage of flames, etc., from between the pack lid and the side frame.

[0025] According to exemplary embodiments of the present invention, a pack lead with improved performance and reliability can be provided.

[0026] According to exemplary embodiments of the present invention, a battery pack with enhanced safety can be provided.

[0027] According to exemplary embodiments of the present invention, a battery pack with improved performance and reliability can be provided.

[0028] The effects obtainable from the exemplary embodiments of the present invention are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects resulting from the implementation of 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.

[0029] FIG. 1 is an exploded perspective view of a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0030] FIG. 2 is a perspective view illustrating a pack housing of a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0031] FIG. 3 is a perspective view illustrating the pack lead of a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0032] FIG. 4 is an enlarged view illustrating the pack lead of a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0033] FIG. 5 is an enlarged cross-sectional view illustrating the pack lead of a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0034] FIG. 6 is an enlarged view illustrating a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0035] FIG. 7 is an enlarged view illustrating a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0036] FIG. 8 is a drawing for explaining a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0037] FIG. 9 is an enlarged view illustrating a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0038] FIG. 10 is an enlarged view illustrating a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0039] FIG. 11 is an enlarged view illustrating a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0040] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0041] Therefore, 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; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0042] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0043] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0044]

[0045] (1st embodiment)

[0046] FIG. 1 is an exploded perspective view of a battery pack (100) according to exemplary embodiments of the technical concept of the present invention.

[0047] FIG. 2 is a perspective view for explaining a pack housing (110) of a battery pack (100) according to exemplary embodiments of the technical concept of the present invention.

[0048] FIG. 3 is a perspective view for explaining the pack lead (120) of a battery pack (100) according to exemplary embodiments of the technical concept of the present invention.

[0049] FIG. 4 is an enlarged view for explaining the pack lead (120) of a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 4 is an enlarged view corresponding to the EX1 area of ​​FIG. 3, and is a drawing for explaining the center (120C), the first edge portion (120E1), and the second edge portion (120E2) of the pack lead (120).

[0050] FIG. 5 is an enlarged cross-sectional view illustrating a pack lead (120) of a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 5 is a cross-sectional view along line AA of FIG. 4.

[0051]

[0052] Referring to FIGS. 1 and 2, the battery pack (100) may include a pack housing (110), a pack lead (120), and a plurality of battery cell assemblies (130). The battery pack (100) may be a final product mounted in an application such as a vehicle.

[0053] In the embodiments, the pack housing (110) may provide an internal space (118) for mounting battery cell assemblies (130). The pack housing (110) may include a base plate (111), a side frame (110S), a center beam (116), and a cross beam (117).

[0054] Here, the first direction (D1) and the second direction (D2) may be substantially parallel to the mounting surface of the base plate (111) (i.e., the surface facing the battery cell assembly (130)), and the third direction (D3) may be substantially perpendicular to the mounting surface of the base plate (111).

[0055] The base plate (111) may be provided by an extrusion process. The side frame (110S) may include side walls (112, 113, 114, 115). Each of the side walls (112, 113, 114, 115) may be provided by an extrusion process. The side walls (112, 113, 114, 115) may be substantially perpendicular to the base plate (111). The center beam (116) may extend in a first direction (D1). The center beam (116) may be interposed between the side walls (112, 113, 114, 115). The cross beams (117) may extend in a second direction (D2). Cross beams (117) can be interposed between side walls (112, 113, 114, 115).

[0056] In the embodiments, a plurality of battery cell assemblies (130) may be placed on a base plate (111) of a pack housing (110). Each of the plurality of battery cell assemblies (130) may be accommodated in an internal space (118) of the pack housing (110). The base plate (111) may support the plurality of battery cell assemblies (130). Side walls (112, 113, 114, 115) may horizontally surround the plurality of battery cell assemblies (130). The side walls (112, 113, 114, 115) may protect the plurality of battery cell assemblies (130).

[0057] In the embodiments, the pack lead (120) may cover elements mounted inside the battery pack (100), such as a plurality of battery cell assemblies (130) and electrical components. The pack lead (120) may be secured to the pack housing (110) by mechanical coupling means, such as bolting. The pack lead (120) may be coupled to the side frame (110S) of the pack housing (110).

[0058] In FIG. 1, the arrangement of multiple battery cell assemblies (130) can be described as a 3 * 2 arrangement. The arrangement of multiple battery cell assemblies (130) disclosed in FIG. 1 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 be able to easily arrive at a plurality of battery cell assemblies (130) arranged in an M * N arrangement (where M and N are each integers greater than or equal to 2) based on what is described herein.

[0059] Hereinafter, the technical concept of the present invention is explained with reference to an embodiment in which each of the plurality of battery assemblies (130) 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 be able to easily arrive at an embodiment in which battery cells are directly mounted within a pack case as well as a battery pack in which a plurality of battery assemblies including a module frame are employed, based on what is described herein.

[0060] In the embodiments, the pack housing (110) may further include a plurality of first burial guides (151) and a plurality of second burial guides (153).

[0061] A plurality of first embedded guides (151) may be disposed on the side frame (110S). A plurality of first embedded guides (151) may be disposed on the corners of the upper surface of the side frame (110S). A plurality of first embedded guides (151) may be partially embedded in the side frame (110S). A plurality of first embedded guides (151) may partially protrude from the side frame (110S).

[0062] A plurality of second embedded guides (153) may be disposed on the side frame (110S). A plurality of second embedded guides (153) may be disposed on the upper surface of the side frame (110S). A plurality of second embedded guides (153) may be interposed between a plurality of first embedded guides (151). A plurality of second embedded guides (153) may be coupled to the upper surface of the side frame (110S). A plurality of second embedded guides (153) may be partially embedded in the side frame (110S). A plurality of second embedded guides (153) may partially protrude from the side frame (110S).

[0063] Each of the plurality of first and second burial guides (151, 153) may include a metallic material. Each of the plurality of first and second burial guides (151, 153) may include, for example, aluminum. Each of the plurality of first and second burial guides (151, 153) may also include steel such as, for example, carbon steel, nickel steel, chrome steel, nickel-chrome steel, and manganese steel.

[0064] In the embodiments, the battery pack (100) may further include a Battery Management System (BMS). The BMS may be configured to perform monitoring, balancing, and control of the battery pack (100). Monitoring of the battery pack (100) may include measuring the voltage and current of specific nodes within a plurality of battery cell assemblies (130) and measuring the 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.

[0065] Balancing of the battery pack (100) is an operation that reduces deviations between multiple battery cell assemblies (130). 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, and accordingly, the shortening of the lifespan of each of the multiple battery cell assemblies (130) can be prevented.

[0066] In the embodiments, the battery pack (100) may further include additional electrical components such as a cooling device, a Power Relay Assembly (PRA), and a safety plug. The cooling device may include a cooling fan. The cooling fan can prevent overheating of each of the plurality of battery cell assemblies (130) 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 can protect the plurality of battery cell assemblies (130) and the external load (e.g., a vehicle motor) by cutting off power supply to the external load (e.g., a vehicle motor) in situations where abnormal voltage, such as a voltage surge, occurs. Additional electrical components may be interposed between the plurality of battery cell assemblies (130) and the side wall (115). The space between the battery cell assemblies (130) and the side wall (115) may be referred to as an electrical component mounting area.

[0067] In the embodiments, the battery pack (100) may further include a plurality of interbusbars configured to electrically connect a plurality of battery cell assemblies (130). The plurality of battery cell assemblies (130) may be connected in series by the plurality of interbusbars. Accordingly, the battery pack (100) may be configured to output a high voltage to an external load (e.g., a motor of a vehicle).

[0068]

[0069] Referring together to FIGS. 3 through 5, the pack lid (120) may include a center (120C) and edge portions (120E1, 120E2, 120E3 and 120E4) surrounding the center (120C). The center (120C) may extend in a first direction (D1) and a second direction (D2). The center (120C) may overlap with the pack housing (110) in a third direction (D3). The center (120C) may overlap with the battery cell assemblies (130) in a third direction (D3).

[0070] In the embodiments, the first edge portion (120E1) may be arranged in a second direction (D2) with the center (120C). The first edge portion (120E1) may extend in a first direction (D1). Specifically, the first edge portion (120E1) may include a first reinforcing portion (120E1_1) and a first side portion (120E1_2). For example, the first reinforcing portion (120E1_1) may be connected to the center (120C) and extend in a first direction (D1). For example, the first reinforcing portion (120E1_1) may be an extension from the center (120C). For example, the first side portion (120E1_2) may extend from the first reinforcing portion (120E1_1) in a third direction (D3). Specifically, the thickness of the first reinforcing part (120E1_1) may differ from the thickness of the center (120C).

[0071] As illustrated in FIG. 5, the first reinforcing member (120E1_1) may include a first part (120E1_11) connected to the center (120C) and a second part (120E1_12) on the first part (120E1_11). The thickness of the first reinforcing member (120E1_1) may be greater than the thickness of the center (120C).

[0072] In the embodiments, the first part (120E1_11) may be directly connected to the center (120C). For example, one end of the first part (120E1_11) in the second direction (D2) may be connected to the center (120C). For example, the first part (120E1_11) may include a portion formed integrally with the center (120C).

[0073] Specifically, the first part (120E1_11) may have substantially the same thickness as the center (120C). The first part (120E1_11) may have substantially the same thickness as the center (120C) in the third direction (D3). For example, the first part (120E1_11) may overlap with the center (120C) in the second direction (D2). The first part (120E1_11) may be located on the same level as the center (120C) in the third direction (D3). The upper and lower surfaces of the first part (120E1_11) may be co-planes with the upper surface (120C_a) and lower surface (120C_b), respectively, of the center (120C). The first part (120E1_11) may be parallel to the center (120C).

[0074] In the embodiments, the second part (120E1_12) may be a bent portion extending from the first part (120E1_11). The other end opposite to the first part (120E1_11) in the second direction (D2) may be connected to the second part (120E1_12). The second part (120E1_12) may overlap the first part (120E1_11) in the third direction (D3). The second part (120E1_12) may not overlap the first part (120E1_11) in the second direction (D2). The second part (120E1_12) may not overlap the center (120C) in the second direction (D2). For example, the second part (120E1_12) may be formed by bending a portion extending from the center (120C) using a press hemming method. Accordingly, the second part (120E1_12) may include a U-shape.

[0075] Specifically, the second part (120E1_12) may have a greater thickness than the center (120C). The second part (120E1_12) may have a greater thickness than the first part (120E1_11). For example, the thickness of the second part (120E1_12) may be substantially twice the thickness of the center (120C). The third direction (D3) thickness of the second part (120E1_12) may be substantially twice the third direction (D3) thickness of the center (120C). The third direction (D3) thickness of the second part (120E1_12) may be substantially twice the third direction (D3) thickness of the first part (120E1_11). The second part (120E1_12) may include a portion parallel to the center (120C).

[0076] To summarize, the thickness of the first reinforcing member (120E1_1) may be substantially three times the thickness of the center (120C). For example, the thickness of the first reinforcing member (120E1_1) in the third direction (D3) may be substantially three times the thickness of the center (120C) in the third direction (D3). The first reinforcing member (120E1_1) may be parallel to the center (120C). The first reinforcing member (120E1_1) may include an L-shape. The first reinforcing member (120E1_1) may overlap the center (120C) in the second direction (D2).

[0077] In the embodiments, the first side portion (120E1_2) is connected to one end of the second portion (120E1_12) of the first reinforcing portion (120E1_1) and may extend in a direction intersecting the first reinforcing portion (120E1_1). Specifically, the first side portion (120E1_2) may extend in a third direction (D3). For example, the first side portion (120E1_2) may be formed by bending the portion extending from the first reinforcing portion (120E1_1) so that it extends in the third direction (D3). For example, the first side portion (120E1_2) may extend from the upper surface (120C_a) of the center (120C) toward the lower surface (120C_b). For example, the first side portion (120E1_2) can overlap with the first reinforcing portion (120E1_1) in the second direction (D2). The first side portion (120E1_2) can overlap with the center (120C) in the second direction (D2).

[0078] Referring again to FIGS. 3 and 4, the second edge portion (120E2) may be arranged in a first direction (D1) with the center (120C). The second edge portion (120E2) may extend in a second direction (D2). Specifically, the second edge portion (120E2) may include a second reinforcing portion (120E2_1) and a second side portion (120E2_2). For example, the second reinforcing portion (120E2_1) may be connected to the center (120C) and may extend in a second direction (D2). For example, the second reinforcing portion (120E2_1) may extend from the center (120C). For example, the second side portion (120E2_2) may extend from the second reinforcing portion (120E2_1) in a third direction (D3). Specifically, the thickness of the second reinforcing part (120E2_1) may differ from the thickness of the center (120C).

[0079] In the embodiments, the second edge portion (120E2) may have substantially the same shape as the first edge portion (120E1).

[0080] Specifically, the second reinforcing portion (120E2_1) of the second edge portion (120E2) may be formed by bending a portion extending from the center (120C). The thickness of the second reinforcing portion (120E2_1) may be greater than the thickness of the center (120C). The second reinforcing portion (120E2_1) may include a portion directly connected to the center (120C) and may include a portion formed integrally with the center (120C). The thickness of the second reinforcing portion (120E2_1) may be substantially three times the thickness of the center (120C). For example, the third direction (D3) thickness of the second reinforcing portion (120E2_1) may be substantially three times the third direction (D3) thickness of the center (120C). The second reinforcing portion (120E2_1) may include a portion parallel to the center (120C). The second reinforcing member (120E2_1) may include an L-shape. The second reinforcing member (120E2_1) may overlap with the center (120C) in the first direction (D1).

[0081] Specifically, the second side portion (120E2_2) is connected to one end of the second reinforcing portion (120E2_1) and can extend from therein in a third direction (D3). For example, the second side portion (120E2_2) can extend from the upper surface (120C_a) of the center (120C) toward the lower surface (120C_b). For example, the second side portion (120E2_2) can overlap with the second reinforcing portion (120E2_1) in a first direction (D1). The second side portion (120E2_2) can overlap with the center (120C) in a first direction (D1).

[0082] In the embodiments, the third edge portion (120E3) may be arranged in a second direction (D2) with respect to the center (120C). The third edge portion (120E3) may extend in a first direction (D1). The third edge portion (120E3) may be parallel to the first edge portion (120E1). Specifically, the third edge portion (120E3) may include a third reinforcing portion (not shown) and a third side portion (not shown). The third reinforcing portion is connected to the center (120C) and may extend in the first direction (D1). For example, the third reinforcing portion may be formed by bending a portion extending from the center (120C). The third side portion may extend from the third reinforcing portion in a third direction (D3). The third side portion may overlap the third reinforcing portion in the second direction (D2). The third side portion may overlap the center (120C) and the second direction (D2). The thickness of the third reinforcing portion may be greater than the thickness of the center (120C). For a description of the third edge portion (120E3), refer to the description of the first edge portion (120E1).

[0083] In the embodiments, the fourth edge portion (120E4) may be arranged in the first direction (D1) with the center (120C). The fourth edge portion (120E4) may extend in the second direction (D2). The fourth edge portion (120E4) may be parallel to the second edge portion (120E2). Specifically, the fourth edge portion (120E4) may include a fourth reinforcing portion (not shown) and a fourth side portion (not shown). The fourth reinforcing portion is connected to the center (120C) and may extend in the second direction (D2). For example, the fourth reinforcing portion may be formed by bending a portion extending from the center (120C). The fourth side portion may extend from the fourth reinforcing portion in the third direction (D3). The fourth side portion may overlap the fourth reinforcing portion in the first direction (D1). The fourth side portion may overlap the center (120C) and the first direction (D1). The thickness of the fourth reinforcing portion may be greater than the thickness of the center (120C). For a description of the fourth edge portion (120E4), refer to the description of the second edge portion (120E2).

[0084]

[0085] A pack lead (120) according to embodiments of the technical concept of the present invention described with reference to FIGS. 1 to 5 may include edge portions (120E1, 120E2, 120E3 and 120E4).

[0086] Specifically, the edge portions (120E1, 120E2, 120E3 and 120E4) may include a reinforcing portion (e.g., a first reinforcing portion (120E1_1) or a second reinforcing portion (120E2_1)) having a thickness greater than that of the center portion (120C). By doing so, the strength of the pack lid (120) is increased, and in particular, the strength of the fastening portion with the side frame (110S) can be increased.

[0087] Additionally, the edge portions (120E1, 120E2, 120E3 and 120E4) may include a side portion (e.g., a first side portion (120E1_2) or a second side portion (120E2_2)) extending from the reinforcing portion. By doing so, it is possible to prevent the leakage of flames, etc. from inside the battery pack (100).

[0088] According to embodiments of the technical concept of the present invention, a pack lead (120) with improved performance and reliability can be provided.

[0089] According to embodiments of the technical concept of the present invention, a pack lid (120) with enhanced safety can be provided.

[0090]

[0091] FIG. 6 is an enlarged view for illustrating a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 6 is a drawing for illustrating the pack lead (120) and side frame (110S) of the battery pack (100).

[0092] FIG. 7 is an enlarged view for illustrating a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 7 is a drawing for illustrating the pack lead (120) and side frame (110S) of the battery pack (100), and shows the battery pack (100) viewed from a different direction than FIG. 6.

[0093] FIG. 8 is a drawing for explaining a battery pack (100) according to exemplary embodiments based on the technical concept of the present invention.

[0094] FIG. 9 is an enlarged view for explaining a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 9 is an enlarged view corresponding to the EX2 area of ​​FIG. 8, and is a drawing for explaining the relationship between the pack lead (120) and the side frame (110S).

[0095]

[0096] Referring to FIGS. 6 and FIGS. 7 together, the pack lid (120) can be joined to the side frame (110S). As previously described, the pack lid (120) may include a center (120C), a first edge portion (120E1), and a second edge portion (120E2). The first edge portion (120E1) and the second edge portion (120E2) may overlap with the side frame (110S) in a third direction (D3). The first edge portion (120E1) and the second edge portion (120E2) may be joined to the side frame (110S) by mechanical joining means such as bolting (122). The first edge portion (120E1) and the second edge portion (120E2) may include a reinforcing portion and a side portion, and regarding this, I will explain in detail with reference to FIGS. 8 and 9 using the first edge portion (120E1) as an example.

[0097]

[0098] Referring to FIGS. 8 and FIGS. 9 together, a plurality of battery cell assemblies (130) may be accommodated in a pack housing (110) of a battery pack (100), and a pack lid (120) may cover them. The pack housing (110) may include a side frame (110S) surrounding the plurality of battery cell assemblies (130), and the pack lid (120) may be coupled to the side frame (110S).

[0099] In the embodiments, each of the plurality of battery cell assemblies (130) may include a plurality of battery cells. The plurality of battery cells may be arranged in a first direction (D1).

[0100] In the embodiments, the pack lead (120) may include a center (120C) and edge portions (120E1, 120E2, 120E3, and 120E4) surrounding the center (120C). FIG. 8 is a cross-sectional view of a battery pack (100) described with reference to FIG. 1 and FIG. 2, illustrating the first edge portion (120E1) and the third edge portion (120E3) among the edge portions (120E1, 120E2, 120E3, and 120E4) of the pack lead (120).

[0101] As illustrated in FIG. 9, the pack lid (120) may include a center (120C) and a first edge portion (120E1). The first edge portion (120E1) may be arranged in a second direction (D2) with respect to the center (120C). The first edge portion (120E1) may extend in a first direction (D1). Specifically, the first edge portion (120E1) may include a first reinforcing portion (120E1_1) and a first side portion (120E1_2). The first reinforcing portion (120E1_1) may include a first portion (120E1_11) connected to the center (120C) and a second portion (120E1_12) on the first portion (120E1_11). The thickness of the first reinforcing part (120E1_1) may be greater than the thickness of the center (120C). Regarding the first reinforcing part (120E1_1) and the first side part (120E1_2) of the first edge part (120E1), reference may be made to the description with reference to FIGS. 3 to 5.

[0102] In the embodiments, the first reinforcing member (120E1_1) of the first edge portion (120E1) may be placed on the side frame (110S). The first reinforcing member (120E1_1) may overlap the side frame (110S) in a third direction (D3). The first reinforcing member (120E1_1) may be joined to the side frame (110S). For example, the first reinforcing member (120E1_1) may be joined to the side frame (110S) by bolting.

[0103] In the embodiments, a gasket (121) may be disposed between the first reinforcing member (120E1_1) and the side frame (110S). The gasket (121) may comprise a material having elasticity in response to pressure applied to join the pack lid (120) and the housing (110). Additionally, the gasket (121) may comprise a material having sufficient rigidity to withstand high temperature and high pressure conditions occurring inside the housing (110). The gasket (121) may comprise rubber synthesized from a material such as EPDM (ethylene-propylene diene monomer), for example. In some embodiments, the gasket (121) may comprise a metal piece.

[0104] In the embodiments, the first side portion (120E1_2) of the first edge portion (120E1) may extend in a third direction (D3) from the first reinforcing portion (120E1_1). For example, the first side portion (120E1_2) may overlap with the first reinforcing portion (120E1_1) and the center (120C) in a second direction (D2). The first side portion (120E1_2) may overlap with the side frame (110S) in a second direction (D2). The first side portion (120E1_2) may overlap with the gasket (121) in a second direction (D2).

[0105]

[0106] A battery pack (100) according to embodiments of the technical concept of the present invention described with reference to FIGS. 1 to 9 may include a pack lead (120) comprising edge portions (120E1, 120E2, 120E3 and 120E4).

[0107] Specifically, the edge portions (120E1, 120E2, 120E3 and 120E4) may include a reinforcing portion (e.g., a first reinforcing portion (120E1_1) or a second reinforcing portion (120E2_1)) having a thickness greater than that of the center (120C). By doing so, the strength of the pack lid (120) is increased, and in particular, the fastening strength with the side frame (110S) can be increased.

[0108] Additionally, the edge portions (120E1, 120E2, 120E3 and 120E4) may include a side portion (e.g., a first side portion (120E1_2) or a second side portion (120E2_2)) extending from the reinforcing portion. The side portion may be extended to overlap with the side frame (110S) to prevent the leakage of flames, etc., from between the pack lid (120) and the side frame (110S).

[0109] According to embodiments of the technical concept of the present invention, a battery pack (100) with improved performance and reliability can be provided.

[0110] According to embodiments of the technical concept of the present invention, a battery pack (100) with enhanced safety can be provided.

[0111]

[0112] (2nd Example)

[0113] FIG. 10 is an enlarged view for explaining a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 10 is an enlarged view corresponding to the EX2 area of ​​FIG. 8, and is a drawing for explaining the relationship between the pack lead (120A) and the side frame (110S).

[0114] Referring to FIG. 10, the pack lid (120A) may include a center (120AC) and a first edge portion (120AE1). The first edge portion (120AE1) may be arranged in a second direction (D2) with respect to the center (120AC). The first edge portion (120AE1) may extend in a first direction (D1). Specifically, the first edge portion (120AE1) may include a first reinforcing portion (120AE1_1) and a first side portion (120AE1_2).

[0115] In the embodiments, the first reinforcing portion (120AE1_1) of the first edge portion (120AE1) may include a portion directly connected to the center (120AC). The first reinforcing portion (120AE1_1) of the first edge portion (120AE1) may include a portion formed integrally with the center (120AC). The thickness of the first reinforcing portion (120AE1_1) of the first edge portion (120AE1) may be greater than the thickness of the center (120AC). The thickness of the first reinforcing portion (120AE1_1) of the first edge portion (120AE1) may be substantially three times the thickness of the center (120AC). In this case, the thickness of the center (120AC) is the thickness in the third direction (D3), and the thickness of the first reinforcing portion (120AE1_1) may be the thickness in the direction intersecting the third direction (D3).

[0116] Specifically, the first reinforcing member (120AE1_1) may intersect with the center (120AC). The first reinforcing member (120AE1_1) may be formed by bending a portion extending from the center (120AC). The first reinforcing member (120AE1_1) may extend in a first direction (D1) along the edge of the center (120AC) and may extend in a fourth direction (D4) from a portion connected to the center (120AC). The fourth direction (D4) lies in a plane with the second direction (D2) and the third direction (D3) and may intersect with the first direction (D1). For example, the first reinforcing member (120AE1_1) may be bent from the center (120AC). For example, the first reinforcing member (120AE1_1) may be formed by bending a portion extending from the center (120C) using a press hemming method. For example, the first reinforcing member (120AE1_1) may include an L-shape.

[0117] In the embodiments, the first side portion (120AE1_2) is connected to one end of the first reinforcing portion (120AE1_1) and may extend in a direction intersecting the first reinforcing portion (120AE1_1). Specifically, the first side portion (120AE1_2) may extend in a third direction (D3). For example, the first side portion (120AE1_2) may extend from the upper surface of the center (120AC) toward the lower surface. In this specification, the lower surface of the center (120AC) may refer to the surface facing the pack housing (110), and the upper surface of the center (120AC) may refer to the surface opposite to the lower surface. For example, the first side portion (120AE1_2) may overlap with the first reinforcing portion (120AE1_1) in a second direction (D2). The first side portion (120AE1_2) can overlap with the center (120AC) in the second direction (D2). The first side portion (120AE1_2) can overlap with the side frame (110S) in the second direction (D2). The first side portion (120AE1_2) can overlap with the gasket (121) in the second direction (D2).

[0118]

[0119] According to embodiments of the technical concept of the present invention, a pack lead (120A) with improved performance and reliability can be provided.

[0120] According to embodiments of the technical concept of the present invention, a pack lead (120A) with enhanced safety can be provided.

[0121] According to embodiments of the technical concept of the present invention, a battery pack (100) with improved performance and reliability can be provided.

[0122] According to embodiments of the technical concept of the present invention, a battery pack (100) with enhanced safety can be provided.

[0123]

[0124] (3rd Example)

[0125] FIG. 11 is an enlarged view for explaining a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 11 is an enlarged view corresponding to the EX2 area of ​​FIG. 8, and is a drawing for explaining the relationship between the pack lead (120B) and the side frame (110S).

[0126] Referring to FIG. 11, the pack lid (120B) may include a center (120BC) and a first edge portion (120BE1). The first edge portion (120BE1) may be arranged in a second direction (D2) with respect to the center (120BC). The first edge portion (120BE1) may extend in a first direction (D1). Specifically, the first edge portion (120BE1) may include a first reinforcing portion (120BE1_1) and a first side portion (120BE1_2).

[0127] In the embodiments, the first reinforcing portion (120BE1_1) of the first edge portion (120BE1) may include a portion directly connected to the center (120BC). The first reinforcing portion (120BE1_1) of the first edge portion (120BE1) may include a portion formed integrally with the center (120BC). For example, the first reinforcing portion (120BE1_1) may include a third portion (120BE1_13) directly connected to the center (120BC). The thickness of the first reinforcing portion (120BE1_1) of the first edge portion (120BE1) may be greater than the thickness of the center (120BC).

[0128] Specifically, the first reinforcing member (120BE1_1) may include a portion that intersects with the center (120BC). For example, the third portion (120BE1_13) of the first reinforcing member (120BE1_1) may intersect with the center (120BC). The first reinforcing member (120BE1_1) may be formed by bending a portion extending from the center (120BC). The first reinforcing member (120BE1_1) may extend in a first direction (D1) along the edge of the center (120BC). The third portion (120BE1_13) of the first reinforcing member (120BE1_1) may extend in a fifth direction (D5) from a portion connected to the center (120BC). The fifth direction (D5) lies in the same plane as the second direction (D2) and the third direction (D3) and may intersect with the first direction (D1). For example, the first reinforcing member (120BE1_1) may be bent from the center (120BC). For example, the first reinforcing member (120BE1_1) may be formed by bending a portion extending from the center (120C) using a press hemming method. For example, the first reinforcing member (120BE1_1) may include an L-shape.

[0129] In the embodiments, the first side portion (120BE1_2) is connected to one end of the first reinforcing portion (120BE1_1) and may extend in a direction intersecting the first reinforcing portion (120BE1_1). Specifically, the first side portion (120BE1_2) may extend in a third direction (D3). For example, the first side portion (120BE1_2) may extend from the upper surface of the center (120BC) toward the lower surface. In this specification, the lower surface of the center (120BC) may refer to the surface facing the pack housing (110), and the upper surface of the center (120BC) may refer to the surface opposite to the lower surface. For example, the first side portion (120BE1_2) may overlap with the first reinforcing portion (120BE1_1) in a second direction (D2). The first side portion (120BE1_2) can overlap with the center (120BC) in the second direction (D2). The first side portion (120BE1_2) can overlap with the side frame (110S) in the second direction (D2). The first side portion (120BE1_2) can overlap with the gasket (121) in the second direction (D2).

[0130]

[0131] According to embodiments of the technical concept of the present invention, a pack lead (120B) with improved performance and reliability may be provided.

[0132] According to embodiments of the technical concept of the present invention, a pack lid (120B) with enhanced safety can be provided.

[0133] According to embodiments of the technical concept of the present invention, a battery pack (100) with improved performance and reliability can be provided.

[0134] According to embodiments of the technical concept of the present invention, a battery pack (100) with enhanced safety can be provided.

[0135]

[0136] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

Claims

1. A central part extending in a first direction and a second direction intersecting the first direction; and It includes the above-mentioned central part and a first edge portion arranged in the above-mentioned second direction and extending in the above-mentioned first direction, The first edge portion comprises a first reinforcing portion connected to the center, and a first side portion extending from the first reinforcing portion in a third direction intersecting the first direction and the second direction, respectively. Pack lead, the thickness of the first reinforcing part is different from the thickness of the center.

2. In Paragraph 1, Pack lead, the thickness of the first reinforcing part is greater than the thickness of the center.

3. In Paragraph 1, The above first side portion overlaps the above first reinforcing portion and the above second direction, forming a pack lead.

4. In Paragraph 1, The above first reinforcing part is a pack lead including a portion parallel to the center.

5. In Paragraph 4, A pack lead in which the third-direction thickness of the first reinforcing part is three times the third-direction thickness of the center.

6. In Paragraph 1, The above first reinforcing part is a pack lead including a portion that intersects the above center.

7. In Paragraph 1, The above-mentioned first reinforcing member is a pack lead including an L-shape.

8. In Paragraph 1, It further includes the above-mentioned central part and a second edge portion arranged in the above-mentioned first direction and extending in the above-mentioned second direction, The second edge portion includes a second reinforcing portion connected to the center, and a second side portion extending from the second reinforcing portion in the third direction. Pack lead, the thickness of the second reinforcing part is greater than the thickness of the center.

9. Pack housing comprising a base plate and a side frame on the base plate; A plurality of battery cell assemblies surrounding the side frame on the base plate; and On the above plurality of battery cell assemblies, a pack lead coupled to the side frame is included, The above pack lid includes a center and an edge portion, and The edge portion includes a reinforcing portion connected to the center portion, and a side portion extending from the reinforcing portion in a direction intersecting the reinforcing portion. The thickness of the central part and the reinforcing part are different from each other, The above side portion is a battery pack that overlaps with the above side frame.

10. In Paragraph 9, The above central part and the above edge part are arranged in a first direction, and The above edge portion extends in a second direction intersecting the first direction, and The above side portion overlaps the above side frame and the above first direction, forming a battery pack.

11. In Paragraph 10, The above reinforcing member overlaps the side frame and the third direction intersecting the first direction and the second direction, respectively, in a battery pack.

12. In Paragraph 9, A battery pack in which the thickness of the reinforcing part is greater than the thickness of the center.

13. In Paragraph 9, The above edge portion extends in a first direction, and A battery pack in which the above-mentioned side portion overlaps the above-mentioned reinforcing portion and the above-mentioned first direction in a second direction intersecting the first direction.

14. In Paragraph 13, A gasket is placed between the above reinforcing part and the above side frame, and The above side portion overlaps the gasket and the second direction, forming a battery pack.

15. In Paragraph 9, A battery pack comprising a portion that intersects the central portion of the reinforcing portion.

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