Battery pack and battery device including same

Abstract

According to exemplary embodiments of the present invention, a battery pack may be provided. The battery pack includes a plurality of battery cells and a housing accommodating the plurality of battery cells. The housing includes: a base plate supporting the plurality of battery cells; and a side frame, surrounding the plurality of battery cells, on the base plate. The side frame may include: an upper portion which is spaced apart from the base plate and parallel to the base plate; and an inclined portion inclined downward from the upper portion to the outside.

Description

Battery pack and battery device including the same

[0001] The present invention relates to a battery pack and a battery device including the same. Specifically, the present invention relates to a battery pack to be stacked and a battery device including the same.

[0002] This application claims the benefit of Korean application No. 10-2024-0187115, filed on December 16, 2024, 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 battery pack that is easy to stack.

[0006] The problem that the technical concept of the present invention aims to solve is to provide a battery device with improved design freedom.

[0007] 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 plurality of battery cells and a housing that accommodates the plurality of battery cells, wherein the housing comprises a base plate that supports the plurality of battery cells; and a side frame that surrounds the plurality of battery cells on the base plate, wherein the side frame may comprise an upper portion spaced apart from the base plate and parallel to the base plate; and an inclined portion that slopes downward from the upper portion toward the outside.

[0008] In some embodiments, the pack lid further comprises covering the plurality of battery cells and coupled to the side frame, wherein the pack lid may include a main plate portion parallel to the base plate and in contact with the upper part of the side frame; and a flange portion inclined downward outward from the main plate.

[0009] In some embodiments, in the pack lid, the flange portion may extend along the four edges of the main plate portion.

[0010] In some embodiments, the flange portion of the pack lead may be positioned on the inclined portion of the side frame.

[0011] In some embodiments, a pack gasket may be further included between the flange portion of the pack lid and the inclined portion of the side frame.

[0012] In some embodiments, the flange portion of the pack lead may include a hemming bending portion at the end.

[0013] In some embodiments, the pack lid is further provided with a fastening bolt for joining the pack lid to the side frame, and the fastening bolt can secure the flange portion of the pack lid to the inclined portion of the side frame.

[0014] In some embodiments, the top of the fastening bolt may be below the top of the pack lid.

[0015] In some embodiments, the side frame includes a first side wall, a second side wall, a third side wall, and a fourth side wall that surround the plurality of battery cells on four sides, and each of the first side wall, the second side wall, the third side wall, and the fourth side wall may include the upper and the inclined portion.

[0016] According to exemplary embodiments of the present invention for solving the above-described problem, a battery device may be provided. The battery device comprises: a first battery pack including a plurality of first battery cells and a first housing that accommodates the plurality of first battery cells; and a second battery pack stacked in a first direction on the first battery pack and including a plurality of second battery cells and a second housing that accommodates the plurality of second battery cells, wherein the first housing comprises: a base plate that supports the plurality of first battery cells; a side frame on the base plate that surrounds the plurality of first battery cells in a second direction and a third direction intersecting the first direction; a pack lid that covers the plurality of first battery cells and is coupled to the side frame; and a fastening bolt that fastens the pack lid to the side frame, wherein the fastening bolt can fasten the pack lid and the side frame in a direction intersecting the first direction.

[0017] In some embodiments, the side frame extends in the second direction on the base plate, and the side frame includes an upper portion spaced apart from the base plate and parallel to the base plate; and an inclined portion inclined downwardly to intersect the first direction and the third direction on the outer side of the upper portion, and the fastening bolt can be coupled to the inclined portion of the side frame.

[0018] In some embodiments, the pack lid comprises a main plate portion parallel to the base plate; and a flange portion extending in the second direction on the outer side of the main plate portion, wherein the flange portion is inclined downward to intersect the first direction and the third direction from the main plate, and the fastening bolt can be coupled to the flange portion of the pack lid.

[0019] In some embodiments, the top of the fastening bolt may be below the bottom of the second battery pack.

[0020] According to exemplary embodiments of the present invention, the battery pack includes an inclined portion sloping downward toward the outside of a side frame and a flange portion sloping downward toward the outside of a pack lid, and a fastening bolt may be provided to join the inclined portion and the flange portion. By doing so, interference during stacking can be minimized.

[0021] According to exemplary embodiments of the present invention, a battery pack that is easy to stack can be provided.

[0022] According to exemplary embodiments of the present invention, a battery device with improved design freedom can be provided.

[0023] 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.

[0024] FIG. 1 is a perspective view for illustrating a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0025] FIG. 2 is a drawing for explaining a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0026] FIG. 3 is a drawing for explaining a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0027] FIG. 4 is an enlarged view illustrating a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0028] FIG. 5 is a drawing of a pack lead for explaining a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0029] FIG. 6 is a drawing for explaining a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0030] FIG. 7 is an enlarged view illustrating a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0031] FIG. 8 is an enlarged view illustrating a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0032] FIG. 9 is a drawing for explaining a battery device according to exemplary embodiments based on the technical concept of the present invention.

[0033] FIG. 10 is an enlarged view illustrating a battery device according to exemplary embodiments based on the technical concept of the present invention.

[0034] 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, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0035] 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.

[0036] 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.

[0037] 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.

[0038]

[0039] (1st embodiment)

[0040] FIG. 1 is a perspective view for explaining a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 1 shows the pack lead (120) and the remaining elements of the battery pack (100) separated.

[0041] FIG. 2 is a drawing for explaining a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 2 is a schematic drawing showing the remaining elements of the battery pack (100), excluding the pack lead (120), viewed from above.

[0042] FIG. 3 is a drawing for explaining a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 3 is a drawing showing the battery pack (100) viewed from the front, with the side wall (113) omitted.

[0043] FIG. 4 is an enlarged view for explaining 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.

[0044]

[0045] Referring to FIG. 1, a battery pack (100) may include a housing (110), a pack lid (120), and a plurality of battery cell assemblies (130) accommodated in the housing (110). The housing (110) may provide a receiving space for mounting the plurality of battery cell assemblies (130). The pack lid (120) is coupled to the housing (110) and may cover the plurality of battery cell assemblies (130). The battery pack (100) may be a final product mounted in an application such as a vehicle.

[0046] Referring to FIG. 2 and FIG. 3 together, the housing (110) may include a base plate (111), a side frame (110S), a center beam (116), and a cross beam (117).

[0047] 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).

[0048] The side frame (110S) may be substantially perpendicular to the base plate (111). The side frame (110S) may include side walls (112, 113, 114, 115). The center beam (116) may extend in a first direction (D1). The center beam (116) may be interposed between the side walls (112, 113).

[0049] The base plate (111) may include a plurality of cooling channels. The plurality of cooling channels may provide a passage for the movement of a refrigerant, such as water, for example.

[0050] A plurality of battery cell assemblies (130) may be placed on a base plate (111) of a housing (110). The base plate (111) may support the plurality of battery cell assemblies (130). A side frame (110S) may horizontally surround the plurality of battery cell assemblies (130). The side frame (110S) may surround the plurality of battery cell assemblies (130) in a first direction (D1) and a second direction (D2). For example, side walls (112, 113, 114, 115) may surround the plurality of battery cell assemblies (130) on four sides. The side frame (110S) may protect the plurality of battery cell assemblies (130).

[0051] In FIGS. 1 and 2, the arrangement of a plurality of battery cell assemblies (130) can be described as a 3 * 2 arrangement. The arrangement of a plurality of battery cell assemblies (130) disclosed in FIGS. 1 and 2 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.

[0052] Hereinafter, the technical concept of the present invention is explained with reference to an embodiment in which each of the plurality of battery cell 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.

[0053] A battery cell assembly (130) may include a plurality of battery cells (131) arranged in a first direction (D1) and a pad (132) arranged between the plurality of battery cells (131). The pad (132) is arranged between the plurality of battery cells (131) in the first direction (D1) and may overlap with the plurality of battery cells (131) in the first direction (D1). For example, the pad (132) may be parallel to the plurality of battery cells (131).

[0054] The pad (132) can absorb swelling of a plurality of battery cells (131). The pad (132) may include a compressible material. The pad (132) may include PU (Polyurethane). The pad (132) may also include a refractory material.

[0055] In the embodiments, the side frame (110S) may include an upper portion parallel to the base plate (111) and an inclined portion sloping downward from the upper portion. Specifically, each of the side walls (112, 113, 114, 115) may include an upper portion parallel to the base plate (111) and an inclined portion sloping downward from the upper portion. Below, the case of the side wall (114) will be described as an example with reference to FIG. 4.

[0056] Referring to FIG. 4, the side wall (114) can be extended in a second direction (D2). For example, the length of the side wall (114) in the second direction (D2) may be greater than the width of the side wall (114) in the first direction (D1) and the width in the third direction (D3).

[0057] For example, the side wall (114) may be composed of a plurality of plates or beams extending in a second direction (D2) and may include an internal empty space. For example, the side wall (114) may include an empty space for fastening a fastening member to be fastened, as described below.

[0058] In the embodiments, among the plurality of plates or beams constituting the side wall (114), the portion spaced apart from the base plate (111) and parallel to the base plate (111) may be referred to as the upper portion (114_1). For example, the upper portion (114_1) may refer to the portion located at the top of the plurality of plates or beams constituting the side wall (114). For example, the upper portion (114_1) may extend in a first direction (D1) and a second direction (D2).

[0059] In the embodiments, the inclined portion (114_2) may slope downward outward from the upper portion (114_1). Specifically, the inclined portion (114_2) may extend diagonally downward from the outer side of the upper portion (114_1). For example, the inclined portion (114_2) may extend in a fourth direction (D4) that intersects the first direction (D1) and the third direction (D3). The outer side of the upper portion (114_1) may mean a direction opposite to the direction in which the battery cell assembly (130) surrounded by the side frame (110S) is positioned. The inclined portion (114_2) may extend in a second direction (D2).

[0060]

[0061] FIG. 5 is a drawing of a pack lead (120) for explaining a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 5 is a schematic perspective view showing a pack gasket (127) coupled to the pack lead (120), which is an inverted view of the pack lead (120) and pack gasket (127) of FIG. 1.

[0062] FIG. 6 is a drawing for explaining a battery pack (100) according to exemplary embodiments based on the technical concept of the present invention.

[0063] FIG. 7 is an enlarged cross-sectional view for illustrating a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 7 is an enlarged view corresponding to the EX2 area of ​​FIG. 6.

[0064]

[0065] Referring together to FIGS. 1, FIGS. 5 and FIGS. 6, the battery pack (100) may further include a pack lead (120) coupled to a side frame (110S) of a housing (110). 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 housing (110) by mechanical coupling means, such as bolting. Specifically, the pack lead (120) may be coupled to the side frame (110S).

[0066] In the embodiments, the pack lid (120) may cover a plurality of battery cell assemblies (130). The pack lid (120) may include a main plate portion (121) and flange portions (122, 123, 124, 125). The pack lid (120) may be coupled to the side walls (112, 113, 114, 115) of the side frame (110S).

[0067] In the embodiments, the main plate portion (121) may be parallel to the base plate (111). The main plate portion (121) may be positioned on the upper part of the side frame (110S). For example, the main plate portion (121) may be in contact with the upper part of the side frame (110S). Specifically, the main plate portion (121) may extend in a first direction (D1) and a second direction (D2). For example, the main plate portion (121) may have a flat shape and may include four edges.

[0068] In the embodiments, the flange portions (122, 123, 124, 125) may be extended outwardly downwardly from the main plate portion (121). For example, the flange portions (122, 123, 124, 125) may be extended along the four edges of the main plate portion (121).

[0069] Below, the case of the flange portion (122) will be explained as an example with reference to FIG. 7.

[0070] Referring to FIG. 7, the pack lid (120) may include a main plate portion (121) and a flange portion (122) that slopes downward outward from the main plate portion (121). The flange portion (122) may extend in a second direction (D2) along one edge of the main plate portion (121).

[0071] In the embodiments, the main plate portion (121) may be placed on the upper part (114_1) of the side wall (114). Specifically, the main plate portion (121) may be in contact with the upper part (114_1) of the side wall (114).

[0072] In the embodiments, the flange portion (122) may extend diagonally downward from the outer side of the main plate portion (121). For example, the flange portion (122) may extend in a fourth direction (D4) that intersects the first direction (D1) and the third direction (D3). The outer side of the main plate portion (121) may mean a direction opposite to the direction toward the center of the main plate portion (121).

[0073] The flange portion (122) may be placed on the inclined portion (114_2) of the side wall (114). The flange portion (122) may be placed directly on the inclined portion (114_2) of the side wall (114) or spaced apart with other components in between.

[0074] For example, as illustrated in FIG. 5, a pack gasket (127) may be placed inside the pack lid (120). The pack gasket (127) may comprise a material that is flexible in response to pressure applied to join the pack lid (120) and the housing (110). Additionally, the pack gasket (127) may comprise a material that has sufficient rigidity to withstand high temperature and high pressure conditions occurring inside the housing (110). The pack gasket (127) may comprise rubber synthesized from a material such as EPDM (ethylene-propylene diene monomer), for example. In some embodiments, the pack gasket (127) may comprise a metal piece.

[0075] In the embodiments, when the pack lead (120) and the housing (110) are joined, a pack gasket (127) may be interposed between the pack lead (120) and the housing (110). The pack gasket (127) may be first joined to the pack lead (120), and then the pack lead (120) with the pack gasket (127) joined to it may be joined to the housing (110). For example, the pack gasket (127) may be joined to the pack lead (120) by welding. For example, the pack gasket (127) may be joined to the pack lead (120) by fastening means.

[0076] As illustrated in FIG. 7, a pack gasket (127) may be interposed between the pack lid (120) and the side frame (110S). Specifically, a pack gasket (127) may be interposed between the flange portion (122) of the pack lid (120) and the inclined portion (114_2) of the side wall (114). The pack gasket (127) contacts the flange portion (122) of the pack lid (120) and the inclined portion (114_2) of the side wall (114), respectively, and the flange portion (122) of the pack lid (120) and the inclined portion (114_2) of the side wall (114) may be spaced apart with the pack gasket (127) in between.

[0077] In the embodiments, the pack lid (120) can be joined to the side frame (110S) by a fastening bolt (129). Specifically, the fastening bolt (129) can secure each of the flange portions (122, 123, 124, 125) of the pack lid (120) to the side walls (112, 113, 114, 115) of the side frame (110S). For example, a plurality of fastening holes (128) may be provided in the flange portions (122, 123, 124, 125) of the pack lid (120). The fastening bolt (129) can be fastened to the side walls (112, 113, 114, 115) by passing through the fastening holes (128) provided in the flange portions (122, 123, 124, 125).

[0078] Specifically, the fastening bolt (129) can connect the pack lid (120) and the side frame (110S) in a direction intersecting the third direction (D3). For example, the fastening bolt (129) can connect the pack lid (120) and the side frame (110S) in a diagonal direction intersecting the third direction (D3). For example, the fastening bolt (129) can connect the pack lid (120) and the side frame (110S) in a diagonal direction between the third direction (D3) and the first direction (D1).

[0079] For example, as illustrated in FIG. 7, the fastening bolt (129) can secure the flange portion (122) of the pack lid (120) to the inclined portion (114_2) of the side wall (114). For example, the fastening bolt (129) can secure the flange portion (122) of the pack lid (120) to the inclined portion (114_2) of the side wall (114) by passing through the fastening hole (128) in a diagonal direction between the third direction (D3) and the first direction (D1). Although not illustrated, the pack gasket (127) and the inclined portion (114_2) of the side wall (114) are also provided with fastening holes through which the fastening bolt (129) can pass.

[0080]

[0081] The battery pack (100) described with reference to FIGS. 1 to 7 includes an inclined portion sloping downward toward the outside of a side frame (110S) and a flange portion sloping downward toward the outside of a pack lid (120), and a fastening bolt (129) may be provided to join the inclined portion and the flange portion. The inclined portion and the flange portion joining to each other may be located below the top of the pack lid, and the fastening bolt (129) may also be located below the top of the pack lid. By doing so, interference can be minimized when other elements, such as other battery packs, are to be stacked on the battery pack (100).

[0082] For example, as illustrated in FIG. 7, the top (129_UM) of the fastening bolt (129) may be lower than the top (120_UM) of the pack lid (120). Specifically, the level (first level (LV1)) of the top (129_UM) of the fastening bolt (129) in the third direction (D3) may be lower than the level (second level (LV2)) of the top (120_UM) of the pack lid (120) in the third direction (D3). As described above, the flange portions (122, 123, 124, 125) of the pack lid (120) extend outwardly downwardly inclined from the main plate portion (121), so that the flange portions (122, 123, 124, 125) to which the fastening bolt (129) is fastened may be lower than the main plate portion (121).

[0083] When another element, such as another battery pack, is to be stacked on the battery pack (100), the other battery pack can be stacked on the pack lead (120), and the top (129_UM) of the fastening bolt (129) is positioned below the top (120_UM) of the pack lead (120), thereby minimizing interference between the fastening bolt (129) and the other battery pack. By doing so, the ease of stacking of the battery pack (100) can be improved.

[0084]

[0085] 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.

[0086] 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.

[0087] 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 multiple 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 multiple 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 multiple battery cell assemblies (130) and the side wall (115). The space between the battery cell assembly (130) and the side wall (115) may be referred to as an electrical component mounting area.

[0088]

[0089] According to exemplary embodiments of the technical concept of the present invention, a battery pack (100) that is easy to stack may be provided.

[0090]

[0091] (2nd Example)

[0092] FIG. 8 is an enlarged cross-sectional view illustrating a battery pack according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 8 is an enlarged view corresponding to the EX2 area of ​​FIG. 6. Below, the differences will be explained in detail.

[0093] Referring to FIG. 8, the pack lid (120) may include a main plate portion (121) and a flange portion (122) that slopes downward from the outside of the main plate portion (121). The flange portion (122) may further include a hemming bending portion (126) at its end. By doing so, the pack gasket (127) inside the pack lid (120) can be protected.

[0094] According to exemplary embodiments of the technical concept of the present invention, a battery pack (100) that is easy to stack may be provided.

[0095]

[0096] (3rd Example)

[0097] FIG. 9 is a drawing for explaining a battery device according to exemplary embodiments based on the technical concept of the present invention.

[0098] FIG. 10 is an enlarged cross-sectional view for illustrating a battery device according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 10 is an enlarged view corresponding to the EX3 area of ​​FIG. 9.

[0099]

[0100] Referring to FIG. 9, the battery device may include a first battery pack (100) and a second battery pack (200) stacked in a third direction (D3). The second battery pack (200) may be stacked on the first battery pack (100). The first battery pack (100) and the second battery pack (200) may be similar to the battery pack (100) described with reference to FIG. 1 through 7.

[0101] For example, the first battery pack (100) may include a first battery cell assembly (130) comprising a plurality of first battery cells (131) and a first housing (110) that accommodates the same. The first housing (110) may include a first base plate (111) and a first side frame (110S) on the first base plate (111). The first base plate (111) supports the first battery cell assembly (130), and the first side frame (110S) may surround the first battery cell assembly (130) in a first direction (D1) and a second direction (D2). A first pack lid (120) may cover the first battery cell assembly (130) and the first housing (110).

[0102] Likewise, the second battery pack (200) may include a second battery cell assembly (230) comprising a plurality of second battery cells (231) and a second housing (210) that accommodates the same. The second housing (210) may include a second base plate (211) and a second side frame (210S) on the second base plate (211). A second pack lid (220) may cover the second battery cell assembly (230) and the second housing (210). The second battery pack (200) may be placed on the first pack lid (120) of the first battery pack (100). The second battery pack (200) may be in contact with the first pack lid (120) of the first battery pack (100). The lower surface of the second battery pack (200) may be in contact with the upper surface of the first pack lid (120) of the first battery pack (100).

[0103] Referring together with FIG. 10, the first pack lead (120) of the first battery pack (100) can be coupled to the first side frame (110S).

[0104] Specifically, the first side frame (110S) includes an upper portion (110S_1) and an inclined portion (110S_2), and the inclined portion (110S_2) may extend diagonally downward from the outer side of the upper portion (110S_1). For the description of the upper portion (110S_1) and the inclined portion (110S_2) of the first side frame (110S), refer to the description of the upper portion (114_1) and the inclined portion (114_2) of the side wall (114) with reference to FIGS. 1 to 4.

[0105] Specifically, the first pack lid (120) includes a main plate portion (121) and a flange portion (122), and the flange portion (122) may extend diagonally downward from the outside of the main plate portion (121). The description of the main plate portion (121) and the flange portion (122) of the first pack lid (120) may be described with reference to FIGS. 5 to 7.

[0106] In the embodiments, the fastening bolt (129) can connect the first pack lid (120) to the first side frame (110S) in a direction intersecting the third direction (D3). Specifically, the fastening bolt (129) can connect to the flange portion (122) of the first pack lid (120) and the inclined portion (110S_2) of the first side frame (110S). For example, as the flange portion (122) and the inclined portion (110S_2) each slope downward from the main plate portion (121) and the upper portion (110S_1), respectively, the fastening bolt (129) intersecting therefrom can also intersect the third direction (D3). For example, the fastening bolt (129) can connect the pack lid (120) and the side frame (110S) in a direction intersecting the third direction (D3) and the first direction (D1).

[0107]

[0108] The battery device described with reference to FIGS. 9 and 10 includes a first battery pack (100) at the bottom that is inclined downward toward the outside of a side frame (110S) and a flange portion that is inclined downward toward the outside of a pack lid (120), and a fastening bolt (129) can join the inclined portion and the flange portion. By doing so, interference can be minimized when a second battery pack (200) is to be stacked on the first battery pack (100).

[0109] For example, as illustrated in FIG. 10, the top (129_UM) of the fastening bolt (129) may be lower than the bottom (200_BM) of the second battery pack (200). Specifically, the level (first level (LV1)) of the top (129_UM) of the fastening bolt (129) in the third direction (D3) may be lower than the level (third level (LV3)) of the bottom (200_BM) of the second battery pack (200) in the third direction (D3). By doing so, the second battery pack (200) can be stacked on the first battery pack (100) with minimal interference with the fastening bolt (129) of the first battery pack (100). By doing so, the ease of stacking the battery pack is improved, and the degree of freedom to design a battery device by stacking the battery packs can be enhanced.

[0110] According to exemplary embodiments based on the technical concept of the present invention, a battery pack that is easy to stack can be provided.

[0111] According to exemplary embodiments based on the technical concept of the present invention, a battery device with improved design freedom can be provided.

[0112]

[0113] 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. Includes a plurality of battery cells and a housing that accommodates the plurality of battery cells, and The above housing is, A base plate supporting the plurality of battery cells; and It includes a side frame surrounding the plurality of battery cells on the base plate, A battery pack comprising: a side frame spaced apart from the base plate and parallel to the base plate; and an inclined portion inclined downward from the upper portion.

2. In Paragraph 1, It further includes a pack lid that covers the plurality of battery cells and is coupled to the side frame, A battery pack comprising: a pack lead that is parallel to the base plate and contacts the upper part of the side frame; and a flange portion that slopes downward outward from the main plate.

3. In Paragraph 2, A battery pack, wherein the flange portion extends along the four edges of the main plate portion in the above pack lead.

4. In Paragraph 2, A battery pack, wherein the flange portion of the pack lid is positioned on the inclined portion of the side frame.

5. In Paragraph 2, A battery pack further comprising a pack gasket interposed between the flange portion of the pack lid and the inclined portion of the side frame.

6. In Paragraph 2, A battery pack in which the flange portion of the pack lead includes a hemming bending portion at the end.

7. In Paragraph 2, It further includes a fastening bolt for connecting the above pack lid to the above side frame, The above fastening bolt secures the flange portion of the pack lid to the inclined portion of the side frame, the battery pack.

8. In Paragraph 7, The uppermost part of the above fastening bolt is below the uppermost part of the above pack lead, in a battery pack.

9. In Paragraph 1, The above side frame includes a first side wall, a second side wall, a third side wall, and a fourth side wall that surround the plurality of battery cells on four sides, and A battery pack in which each of the first side wall, second side wall, third side wall, and fourth side wall includes the upper portion and the inclined portion.

10. A first battery pack comprising a plurality of first battery cells and a first housing for accommodating the plurality of first battery cells; and A second battery pack is stacked in a first direction on the first battery pack and includes a plurality of second battery cells and a second housing that accommodates the plurality of second battery cells. The first housing above is, A base plate supporting the plurality of first battery cells; A side frame on the base plate that surrounds the plurality of first battery cells in a second direction and a third direction intersecting the first direction; A pack lid covering the plurality of first battery cells and coupled to the side frame; and It includes a fastening bolt that connects the above pack lid to the above side frame, and The above fastening bolt is a battery device that combines the pack lead and the side frame in a direction intersecting the first direction.

11. In Paragraph 10, The above side frame extends in the second direction on the base plate, and The above side frame includes an upper portion spaced apart from the base plate and parallel to the base plate; and an inclined portion inclined downwardly to intersect the first direction and the third direction on the outer side of the upper portion. A battery device that is coupled to the inclined portion of the side frame with the above-mentioned fastening bolt.

12. In Paragraph 10, The above pack lid includes a main plate portion parallel to the base plate; and a flange portion extending in the second direction on the outer side of the main plate portion. The above flange portion is inclined downward from the main plate to intersect the first direction and the third direction, and The above fastening bolt is coupled to the flange portion of the above pack lid, a battery device.

13. In Paragraph 10, A battery device in which the uppermost part of the above-mentioned fastening bolt is located below the lowermost part of the above-mentioned second battery pack.

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