Battery pack

Abstract

A battery pack is disclosed. A battery pack according to an embodiment of the present invention may comprise: a pack case providing a space therein and including a base plate; a first battery cell including a rigid case and partitioning the interior space of the pack case; and a battery unit which comprises a second battery cell including a flexible case and is located in the space partitioned by the first battery cell.

Description

battery pack

[0001] The present invention relates to a battery pack.

[0002] This application is a priority application for Korean Patent Application No. 10-2024-0179945 filed on December 5, 2024 and Korean Patent Application No. 10-2025-0177287 filed on November 20, 2025, and all contents disclosed in the specifications and drawings of said applications are incorporated into this application by reference.

[0003] As the demand for portable electronic products such as smartphones, tablet PCs, and smartwatches increases significantly and electric vehicles become increasingly widespread, research on batteries installed in them, particularly secondary batteries capable of repeated charging and discharging, is actively underway.

[0004] Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to freely charge and discharge with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density.

[0005] These lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. The lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing, namely a battery case, that seals and houses the electrode assembly together with an electrolyte.

[0006] Generally, lithium secondary batteries can be classified according to the shape of the casing into can-type secondary batteries, in which the electrode assembly is embedded in a metal can, and pouch-type secondary batteries, in which the electrode assembly is embedded in a pouch of aluminum laminate sheet.

[0007] Recently, secondary batteries are widely used for driving or energy storage not only in small devices such as portable electronic devices but also in medium-to-large devices such as electric vehicles and Energy Storage Systems (ESS). A single battery module can be formed by housing multiple such secondary batteries together inside a module case while electrically connected. In this case, each secondary battery included in a single battery module can be referred to as a battery cell. Furthermore, multiple such battery modules can be connected to form a single battery pack.

[0008] However, when a battery pack contains multiple battery modules, and each module contains multiple battery cells, it may be vulnerable to thermal chain reactions between modules or cells. For example, if an event such as thermal runaway occurs within a single battery module, it is necessary to suppress the propagation of this runaway to other battery modules or cells. If the propagation of thermal runaway between modules or cells is not properly suppressed, an event originating in a specific module or cell may trigger a chain reaction of thermal reactions in other modules or cells, potentially causing explosions or fires, or significantly amplifying their scale.

[0009] Therefore, a structure is required that can ensure the rigidity of the battery pack while suppressing battery cell swelling. Additionally, a structure is required that can increase the energy density of the battery pack while suppressing battery cell swelling.

[0010] Accordingly, the present invention is devised to solve the above-mentioned problems and aims to provide a battery pack with an improved structure capable of increasing the rigidity and energy density of the battery pack, and an automobile including the same.

[0011] In addition, another objective of the present invention may be to provide a battery pack structure capable of suppressing swelling of the battery unit by having a battery cell with high rigidity.

[0012] In addition, another objective of the present invention may be to provide a structure that can improve electrical safety by positioning the power terminals of the battery unit far apart.

[0013] In addition, another objective of the present invention may be to provide a structure capable of blocking the propagation of thermal events while improving energy density.

[0014] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by those skilled in the art from the description of the invention below.

[0015] A battery pack according to one embodiment of the present invention for achieving the above-mentioned purpose may include: a pack case having a base plate that provides an internal space; a first battery cell having a rigid case that partitions the internal space of the pack case; and a second battery cell having a flexible case, and a battery unit located in the space partitioned by the first battery cell.

[0016] In addition, the battery pack may further include a heat transfer member disposed between the first battery cell and the base plate.

[0017] Additionally, the second battery cell may be extended along one direction, and the first battery cell may be extended along the length direction of the second battery cell.

[0018] In addition, the first battery cell is provided in plurality, and the plurality of first battery cells may be arranged along the length direction of the second battery cell.

[0019] In addition, the first battery cell may have a rectangular shape.

[0020] Additionally, the battery pack may further include a first interbusbar that physically and electrically connects the first battery cell and the battery unit.

[0021] In addition, the first battery cell includes a power terminal located on the upper surface, and the first interbus bar can be physically connected to the power terminal and the battery unit.

[0022] Additionally, the pack case further includes a side wall installed on the upper surface of the base plate and having a first receiving groove on its inner surface, and a portion of the first battery cell may be received in the first receiving groove.

[0023] Additionally, the pack case further includes a partition wall that partitions the internal space of the pack case and has a second receiving groove, and a portion of the first battery cell can be received in the second receiving groove.

[0024] In addition, the first battery cells are provided in plurality, and the battery unit may be disposed between the plurality of first battery cells.

[0025] Additionally, the battery pack further includes a bracket that provides a receiving space and has an open top surface, and the first battery cell can be received in the bracket.

[0026] In addition, the first battery cell is provided in plurality, and the battery pack may further include a second interbus bar that electrically connects the plurality of first battery cells.

[0027] In addition, the pack case further includes a side wall installed on the upper surface of the base plate, and the bracket may include a first coupling portion coupled to the side wall.

[0028] Additionally, the battery pack may further include a partition wall facing the side wall that partitions the internal space of the pack case, and the bracket may further include a second coupling part that is coupled to the partition wall.

[0029] In addition, the battery unit may be positioned between the side wall and the partition wall.

[0030] An automobile according to one aspect of the present invention includes a battery pack of the present invention.

[0031] According to at least one of the embodiments of the present invention, the rigidity and energy density of the battery pack can be increased.

[0032] According to at least one of the embodiments of the present invention, swelling of the battery unit can be suppressed by providing a battery cell with high rigidity.

[0033] According to at least one of the embodiments of the present invention, electrical safety can be improved by positioning the power terminals of the battery unit far apart.

[0034] According to at least one of the embodiments of the present invention, a structure capable of blocking the propagation of thermal events while improving energy density can be provided.

[0035] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0036] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention.

[0037] Figure 2 is a diagram showing a partial configuration of the battery pack of Figure 1 separated.

[0038] Figure 3 is a diagram showing a partial configuration of the battery pack of Figure 2 separated.

[0039] Figure 4 is a drawing showing the battery unit of Figure 3.

[0040] Figure 5 is a drawing showing the battery unit of Figure 3 in a different direction.

[0041] Figure 6 is a diagram showing a partial configuration of the battery unit of Figure 4 separated.

[0042] Figure 7 is a drawing showing the partition wall assembly of Figure 3.

[0043] Figure 8 is a drawing showing a partial configuration of the partition wall assembly of Figure 7 separated.

[0044] Figure 9 is a drawing showing the cross-sectional configuration along the cutting line A-A' of Figure 1.

[0045] Figure 10 is an enlarged view of part B of Figure 2.

[0046] Figure 11 is an enlarged view of section C of Figure 2.

[0047] Fig. 12 is a plan view of a part of the configuration of the battery pack of Fig. 2.

[0048] Figure 13 is a diagram showing the electrical connection of the battery pack of Figure 12.

[0049] FIG. 14 is a diagram showing a partial configuration of a battery pack according to another embodiment of the present invention.

[0050] Figure 15 is a diagram combining some configurations of the battery pack of Figure 14.

[0051] Figure 16 is a drawing showing the cross-sectional configuration along the cutting line D-D' of Figure 15.

[0052] FIG. 17 is a diagram showing a partial configuration of a battery pack according to another embodiment of the present invention.

[0053] FIG. 18 is a diagram showing the second partition wall and the first battery cell of FIG. 17 separated.

[0054] Figure 19 is a diagram combining some configurations of the battery pack of Figure 17.

[0055] FIG. 20 is an enlarged view of section E of FIG. 19.

[0056] FIG. 21 is an enlarged view of section F of FIG. 19.

[0057] FIG. 22 is a drawing showing a vehicle according to one aspect of the present invention.

[0058] Hereinafter, 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, and 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.

[0059] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely examples of the present invention and do not represent all aspects of the technical concept 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.

[0060] FIG. 1 is a drawing showing a battery pack (1000) according to an embodiment of the present invention. FIG. 2 is a drawing showing a partial configuration of the battery pack (1000) of FIG. 1 separated. FIG. 3 is a drawing showing a partial configuration of the battery pack (1000) of FIG. 2 separated.

[0061] Referring to FIGS. 1 to 3, the pack case (100) may provide an internal space. The pack case (100) may include a base plate (110). The base plate (110) may have a rectangular shape. The base plate (110) may have a flat shape. The base plate (110) may form the exterior of the battery pack (1000). The base plate (110) may provide an internal space for the battery pack (1000).

[0062] The pack case (100) may include side walls (120). The side walls (120) may be installed, fastened, fixed, joined, or attached to the upper surface of the base plate (110). The side walls (120) may be provided along the perimeter of the base plate (110). For example, the side walls (120) may consist of four. The side walls (120) may provide internal space for the battery pack (1000).

[0063] The pack case (100) may include a pack cover (150). The pack cover (150) may have a square plate shape. The pack cover (150) may have a flat plate shape. The pack cover (150) may form the exterior of the battery pack (1000). The pack cover (150) may cover the internal space of the battery pack (1000). The pack cover (150) may be installed, fastened, fixed, coupled, or attached to the side wall (120).

[0064] A battery pack (1000) according to one embodiment of the present invention may include a partition wall (300). The partition wall (300) may include a first partition wall (310) and a second partition wall (320). The partition wall (300) may be provided in multiple numbers. The partition wall (300) may be installed, fastened, fixed, coupled, or attached to the upper surface of a base plate (110). The partition wall (300) may partition the internal space of the battery pack (1000). The partition wall (300) may improve the rigidity of the battery pack (1000).

[0065] The first partition wall (310) may be extended along the front-rear direction or the X-axis direction. The first partition wall (310) may be provided in multiple numbers. The multiple first partition walls (310) may be arranged along the left-right direction or the Y-axis direction.

[0066] The second partition wall (320) may be extended along the left-right direction or the Y-axis direction. A plurality of first partition walls (310) may be arranged on each side of the second partition wall (320).

[0067] A battery pack (1000) according to one embodiment of the present invention may include a partition wall assembly (400). A plurality of partition wall assemblies (400) may be provided. A partition wall assembly (400) may be installed, fastened, fixed, coupled, or attached to the upper surface of a base plate (110). A partition wall assembly (400) may be installed, fastened, fixed, coupled, or attached to a side wall (120). A partition wall assembly (400) may be installed, fastened, fixed, coupled, or attached to a second partition wall (320). A partition wall assembly (400) may partition the internal space of the battery pack (1000).

[0068] The partition wall assembly (400) may be extended along the front-rear direction or the X-axis direction. Multiple partition wall assemblies (400) may be arranged along the left-right direction or the Y-axis direction. The partition wall assembly (400) may include a first battery cell (420, see FIG. 7). The partition wall assembly (400) may improve the rigidity of the battery pack (1000). As the partition wall assembly (400) is provided, the number of first partition walls (310) may be reduced. The partition wall assembly (400) may improve the energy density of the battery pack (1000) while improving the rigidity of the battery pack (1000).

[0069] The battery unit (200) may be placed inside the pack case (100). The battery unit (200) may be installed, fastened, fixed, coupled, or attached to the upper surface of the base plate (110). The battery unit (200) may be provided in multiple numbers. For example, the battery unit (200) may be composed of eight units. The battery unit (200) may be located in the space partitioned by the partition wall (300).

[0070] A venting device (500) may be installed on a side wall (120). For example, the venting device (500) may be installed on the left side wall (120). For example, the venting device (500) may be a gas valve. The venting device (500) may open to release gas when the pressure inside the pack case (100) increases. Additionally, the venting device (500) may block external air from entering the pack case (100). Multiple venting devices (500) may be provided.

[0071] FIG. 4 is a drawing showing the battery unit (200) of FIG. 3. FIG. 5 is a drawing showing the battery unit (200) of FIG. 3 in a different direction. FIG. 6 is a drawing showing a part of the battery unit (200) of FIG. 4 separated.

[0072] Referring to FIGS. 4 to 6, the battery unit (200) may include a top plate (210), a plurality of battery cells (220), a pad (250), a front busbar frame assembly (231), a rear busbar frame assembly (232), a front insulation cover (261), a rear insulation cover (262), a front end cover (241), and a rear end cover (242).

[0073] The top plate (210) may have a flat shape. The top plate (210) may form the exterior of the battery unit (200).

[0074] The second battery cell (220) may be placed below the top plate (210). The second battery cell (220) may represent a secondary battery. In particular, the second battery cell (220) may be a pouch-type secondary battery. However, the shape of the second battery cell (220) is not limited to a pouch shape and may have various shapes, such as a cylindrical shape or a rectangular shape. The second battery cell (220) may be extended along the front-rear direction or the X-axis direction. The second battery cell (220) may be provided in multiple numbers. Multiple second battery cells (220) may be stacked along the left-right direction or the Y-axis direction. Multiple second battery cells (220) may form a stack.

[0075] The second battery cell (220) may include a flexible case (220a). The flexible case (220a) may include a storage portion (221) for accommodating an electrode assembly, a first sealing portion (222) protruding toward the front and rear sides of the storage portion (221), and a second sealing portion (223) protruding toward the upper side of the storage portion (221). Additionally, the second battery cell (220) may include electrode leads (224) protruding toward the front and rear sides of the first sealing portion (222), respectively. The electrode leads (224) may protrude toward the front and rear sides of each second battery cell (220).

[0076] The flexible case (220a) may have a thin thickness. As a result, the energy density of the second battery cell (220) may be increased. Additionally, the battery unit (200) may have a higher energy density by including a plurality of second battery cells (220).

[0077] A pad (250) may be placed between a plurality of second battery cells (220). A pad (250) may be placed between at least some of the second battery cells (220) and / or on the outer edge of the stack. For example, a pad (250) may be configured to be placed between every four second battery cells (220) stacked in the left-right direction.

[0078] These pads (250) may be provided with an elastic material to enable the absorption of swelling of the second battery cell (220). For example, the pads (250) may be composed of a foam material such as polyurethane. Alternatively, the pads (250) may be provided with a material capable of blocking heat or flames. For example, the pads (250) may be provided with an insulating or fireproof material such as silicone or mica.

[0079] A front busbar frame assembly (231) may be provided in front of a plurality of second battery cells (220). The front busbar frame assembly (231) may be electrically connected to the front side electrode leads (224) of the plurality of second battery cells (220).

[0080] The rear busbar frame assembly (232) may be provided at the rear of a plurality of second battery cells (220). The rear busbar frame assembly (232) may be electrically connected to the rear side electrode leads (224) of the plurality of battery cells (220).

[0081] The front end cover (241) can be positioned in front of the front busbar frame assembly (231). The front end cover (241) can have a rectangular shape.

[0082] The rear end cover (242) may be positioned at the rear of the rear busbar frame assembly (232). The rear end cover (242) may have a square shape.

[0083] The front insulation cover (261) may be positioned between the front end cover (241) and the front busbar frame assembly (231). The front insulation cover (261) may electrically insulate the front busbar frame assembly (231) and the front end cover (241).

[0084] The rear insulation cover (262) may be positioned between the rear end cover (242) and the rear busbar frame assembly (232). The rear insulation cover (262) may electrically insulate the rear busbar frame assembly (232) and the rear end cover (242).

[0085] The battery unit (200) may include a first power terminal (231a) protruding forward. The first power terminal (231a) may be provided in the front busbar frame assembly (231). Additionally, the first power terminal (231a) may protrude from the front busbar frame assembly (231). The first power terminal (231a) may be provided as a pair. The first power terminal (231a) may be exposed to the outside of the battery unit (200). The front end cover (241) may expose the first power terminal (231a).

[0086] The battery unit (200) may include a second power terminal (232a) protruding to the rear. The second power terminal (232a) may be provided in the rear busbar frame assembly (232). Additionally, the second power terminal (232a) may protrude from the rear busbar frame assembly (232). The second power terminal (232a) may be provided as a pair. The second power terminal (232a) may be exposed to the outside of the battery unit (200). The rear end cover (242) may expose the second power terminal (232a).

[0087] The battery unit (200) may be equipped with a pair of power terminals (231a, 232a). The pair of power terminals (231a, 232a) may each protrude to one side and the other side in the longitudinal direction of the battery unit (200). The pair of power terminals (231a, 232a) may protrude in opposite directions. As a result, damage to the power terminals (231a, 232a) may be dispersed in the event of a thermal event. Additionally, even if the battery unit (200) is damaged due to a thermal event, the risk of the first power terminal (231a) and the second power terminal (232a) being short-circuited may be reduced.

[0088] FIG. 7 is a drawing showing the partition wall assembly (400) of FIG. 3. FIG. 8 is a drawing showing a partial configuration of the partition wall assembly (400) of FIG. 7 separated. FIG. 9 is a drawing showing a cross-sectional configuration along the cutting line A-A' of FIG. 1.

[0089] Referring to FIGS. 7 through 9, the partition wall assembly (400) may include a first battery cell (420). The first battery cell (420) may represent a secondary battery. In particular, the first battery cell (420) may be a secondary battery having a rectangular shape. However, the shape of the first battery cell (420) is not limited to a rectangular shape and may have various shapes such as a cylindrical shape or a pouch shape. The first battery cell (420) may be extended along the front-rear direction or the X-axis direction. A plurality of first battery cells (420) may be extended along the length direction of the second battery cell (220). A plurality of first battery cells (420) may be provided. A plurality of first battery cells (420) may be arranged along the front-rear direction or the X-axis direction.

[0090] The first battery cell (420) may include a rigid case (420a). The rigid case (420a) may have high strength. The rigid case (420a) may accommodate an electrode assembly inside. The rigid case (420a) may include a metal material. The rigid case (420a) may suppress shape deformation even if a thermal event occurs. The first battery cell (420) can increase the rigidity and energy density of the battery pack (1000).

[0091] The first battery cell (420) may have a third power terminal (421) on its upper surface. The third power terminal (421) may be provided as a pair.

[0092] The partition wall assembly (400) may include a bracket (410). The bracket (410) may include a receiving portion (411). The receiving portion (411) may provide a receiving space. The bracket (410) may have a shape with an open top surface. A first battery cell (420) may be mounted, received, placed, installed, or coupled in the receiving space of the bracket (410). An adhesive member or a heat transfer member may be placed between the first battery cell (420) and the bracket (410). The bracket (410) may receive a plurality of first battery cells (420). The receiving portion (411) may be installed, fastened, fixed, coupled, or attached to the top surface of the base plate (110).

[0093] The bracket (410) may include connecting portions (412a, 412b). The connecting portions (412a, 412b) may extend from the receiving portion (411). The connecting portions (412a, 412b) may be provided as a pair. The first connecting portion (412a) may extend forward of the receiving portion (411). The second connecting portion (412b) may extend backward of the receiving portion (411).

[0094] The first connecting part (412a) may be installed, fastened, fixed, coupled, or attached to the side wall (120). The first connecting part (412a) may be installed, fastened, fixed, coupled, or attached to the top or upper surface of the side wall (120). The fastening member (S) may pass through the pack cover (150) and the first connecting part (412a) and be fastened to the side wall (120).

[0095] The second connecting part (412b) may be installed, fastened, fixed, coupled, or attached to the second partition wall (320). The second connecting part (412b) may be installed, fastened, fixed, coupled, or attached to the top or upper surface of the second partition wall (320). A fastening member (S) may penetrate the second connecting part (412b) and be fastened to the second partition wall (320).

[0096] Figure 10 is an enlarged view of part B of Figure 2.

[0097] Referring to FIG. 10, the battery unit (200) may be located between the first partition wall (310) and the partition wall assembly (400). The partition wall assembly (400) may cover the right side of the battery unit (200). The first partition wall (310) and the partition wall assembly (400) may support the battery unit (200) in the left-right direction or the Y-axis direction. If swelling occurs in the second battery cell (220), the battery unit (200) may swell in the left-right direction or the Y-axis direction. At this time, the first partition wall (310) and the partition wall assembly (400) may suppress the expansion of the battery unit (200).

[0098] The partition wall assembly (400) and the first partition wall (310) can reinforce the rigidity of the battery pack (1000) and suppress swelling of the battery unit (200). The partition wall assembly (400) can increase the energy density of the battery pack (1000) by including the first battery cell (420). The partition wall assembly (400) can replace the first partition wall (310). By providing the partition wall assembly (400), the first partition wall (310) can be provided less frequently.

[0099] Additionally, the partition wall assembly (400) may additionally be provided with a fireproof or fire-resistant member covering the bracket (410) or the first battery cell (420). For example, the partition wall assembly (400) may be covered with an insulating or fireproof material such as silicon or mica. As a result, the partition wall assembly (400) can suppress the propagation of thermal events. The partition wall assembly (400) can replace a configuration that suppresses the propagation of thermal events. For example, the partition wall assembly (400) can replace a configuration such as a thermal barrier. As a result, the configuration of the battery unit (200) can be simplified. Furthermore, as the configuration of the battery unit (200) is simplified, the energy density of the battery unit (200) can be increased.

[0100] Figure 11 is an enlarged view of section C of Figure 2.

[0101] Referring to FIG. 11, the battery unit (200) may be positioned between a pair of partition wall assemblies (400). The pair of partition wall assemblies (400) may cover the left and right sides of the battery unit (200), respectively. The pair of partition wall assemblies (400) may support the battery unit (200) in the left-right direction or the Y-axis direction. If swelling occurs in the second battery cell (220), the battery unit (200) may swell in the left-right direction or the Y-axis direction. At this time, the pair of partition wall assemblies (400) may suppress the expansion of the battery unit (200).

[0102] FIG. 12 is a plan view of a part of the configuration of the battery pack (1000) of FIG. 2. FIG. 13 is a diagram showing the electrical connections of the battery pack (1000) of FIG. 12.

[0103] Referring to FIGS. 10 to 13, a battery pack (1000) according to one embodiment of the present invention may include a first interbus bar (610). The first interbus bar (610) may be provided in multiple numbers. The first interbus bar (610) may electrically connect the battery unit (200) and the partition wall assembly (400). The first interbus bar (610) may physically connect the battery unit (200) and the partition wall assembly (400). The first interbus bar (610) may electrically connect either the first power terminal (231a) or the second power terminal (232a) of the battery unit (200) to the third power terminal (421). The first interbusbar (610) can physically connect the third power terminal (421) to either the first power terminal (231a) or the second power terminal (232a) of the battery unit (200). Due to this connection structure, the first power terminal (231a) and the second power terminal (232a) of the battery unit (200) can be far apart, and the risk of a short circuit between the first power terminal (231a) and the second power terminal (232a) can be reduced.

[0104] The second interbus bar (620) can electrically connect a plurality of first battery cells (420) provided in one partition wall assembly (400). For example, one first interbus bar (610) may be provided for each partition wall assembly (400).

[0105] A plurality of first interbusbars (610) can electrically connect a plurality of battery units (200) provided in a battery pack (1000) and a plurality of partition wall assemblies (400). For example, a plurality of battery units (200) and partition wall assemblies (400) can be connected in series.

[0106] FIG. 14 is a diagram showing a partial configuration of a battery pack (1000) according to another embodiment of the present invention. FIG. 15 is a diagram showing a partial configuration of the battery pack (1000) of FIG. 14 combined. FIG. 16 is a diagram showing a cross-sectional configuration along the cutting line D-D' of FIG. 15.

[0107] Referring to FIGS. 14 through 16, the first battery cell (420) can partition the internal space of the pack case (100). A pair of first battery cells (420) may be arranged along the front-rear direction or the X-axis direction. A pair of first battery cells (420) may be fixed, placed, or installed between adjacent battery units (200). A pair of first battery cells (420) may be fixed, placed, or installed between the battery unit (200) and the first partition wall (310).

[0108] A battery unit (200) may be positioned between a plurality of first battery cells (420). A battery unit (200) may be positioned between two pairs of first battery cells (420). A battery unit (200) may be positioned between a pair of first battery cells (420) and a first partition wall (310). A battery unit (200) may be positioned between a side wall (120) and a second partition wall (320).

[0109] A heat transfer member (700) may be positioned between the first battery cell (420) and the base plate (110). The heat transfer member (700) may attach, combine, or secure the first battery cell (420) to the base plate (110). The heat transfer member (700) may be positioned between the first battery cell (420) and the side wall (120). The heat transfer member (700) may attach, combine, or secure the first battery cell (420) to the side wall (120). The heat transfer member (700) may be positioned between the first battery cell (420) and the second partition wall (320). The heat transfer member (700) may attach, combine, or secure the first battery cell (420) to the second partition wall (320).

[0110] The heat transfer member (700) may include a material with high thermal conductivity. For example, the heat transfer member (700) may be a resin with high thermal conductivity. Alternatively, the heat transfer member (700) may be an adhesive member.

[0111] A plurality of first battery cells (420) may be fixed, installed, coupled, or attached to the pack case (100) by means of a heat transfer member (700). A plurality of first battery cells (420) may be directly fixed, installed, coupled, or attached to the pack case (100) without separate fixing or installing members. As a result, the structure of the battery pack (1000) can be simplified. In addition, by not including separate fixing or installing members for installing the first battery cells (420), the weight of the battery pack (1000) can be reduced and the energy density can be increased.

[0112] The first interbusbar (610) can electrically connect either the first power terminal (231a) or the second power terminal (232a) of the battery unit (200) to the third power terminal (421) of the first battery cell (420). The first interbusbar (610) can physically connect either the first power terminal (231a) or the second power terminal (232a) of the battery unit (200) to the third power terminal (421) of the first battery cell (420).

[0113] The second interbusbar (620) can electrically connect a pair of first battery cells (420) arranged along the X-axis direction. The second interbusbar (620) can electrically connect the third power terminals (421) of a pair of first battery cells (420) arranged along the X-axis direction. The second interbusbar (620) can physically connect a pair of first battery cells (420) arranged along the X-axis direction. The second interbusbar (620) can physically connect the third power terminals (421) of a pair of first battery cells (420) arranged along the X-axis direction.

[0114] FIG. 17 is a diagram showing a portion of a battery pack (1000) according to another embodiment of the present invention separated. FIG. 18 is a diagram showing the second partition wall (320) and the first battery cell (420) of FIG. 17 separated. FIG. 19 is a diagram showing a portion of the battery pack (1000) of FIG. 17 combined. FIG. 20 is an enlarged view of section E of FIG. 19. FIG. 21 is an enlarged view of section F of FIG. 19.

[0115] Referring to FIGS. 17 to 21, the side wall (120) may include a first receiving groove (121) on its inner surface. The first receiving groove (121) may extend along the vertical direction or the Z-axis direction. The first receiving groove (121) may be provided in multiple numbers. The multiple first receiving grooves (121) may be arranged along the left-right direction or the Y-axis direction.

[0116] A portion of the first battery cell (420) may be received, placed, fixed, installed, or coupled in the first receiving groove (121). The first receiving groove (121) can stably support the first battery cell (420). Due to the first receiving groove (121), the first battery cell (420) can be stably coupled to the pack case (100).

[0117] An adhesive member may be placed between the first battery cell (420) and the first receiving groove (121). The adhesive member may more strongly bond, fix, or install the first battery cell (420) in the first receiving groove (121).

[0118] The second partition wall (320) may include a second receiving groove (321) on one side. The second partition wall (320) may include a second receiving groove (321) on the other side. The second receiving groove (321) may extend along the vertical direction or the Z-axis direction. The second receiving groove (321) may be provided in multiple numbers. The multiple second receiving grooves (321) may be arranged along the horizontal direction or the Y-axis direction.

[0119] A portion of the first battery cell (420) may be received, placed, fixed, installed, or coupled in the second receiving groove (321). The second receiving groove (321) can stably support the first battery cell (420). Due to the second receiving groove (321), the first battery cell (420) can be stably coupled to the pack case (100).

[0120] An adhesive member may be placed between the first battery cell (420) and the second receiving groove (321). The adhesive member may more strongly bond, fix, or install the first battery cell (420) in the second receiving groove (321).

[0121] FIG. 22 is a drawing showing a vehicle (V) according to one aspect of the present invention.

[0122] Referring to FIG. 22, the automobile (V) according to the present invention may include the battery pack (1000) of the present invention.

[0123] In addition, the battery pack (1000) according to the present invention may further include various components of a battery pack known at the time of filing the present invention, such as a BMS, a busbar, a relay, a current sensor, etc.

[0124] The battery pack (1000) according to the present invention may be applied to a vehicle such as an electric vehicle or a hybrid vehicle. The vehicle (V) according to the present invention may further include various other components included in the vehicle in addition to the battery pack (1000). For example, the vehicle (V) according to the present invention may further include a vehicle body, a motor, an electronic control unit (ECU), and other control devices.

[0125] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

Claims

1. A pack case that provides internal space and is equipped with a base plate; A first battery cell having a rigid case and partitioning the internal space of the pack case; and, A battery pack comprising a second battery cell having a flexible case and a battery unit located in the space partitioned by the first battery cell.

2. In Paragraph 1, A battery pack further comprising a heat transfer member disposed between the first battery cell and the base plate.

3. In Paragraph 1, The second battery cell above extends along one direction, and The first battery cell is a battery pack extending along the longitudinal direction of the second battery cell.

4. In Paragraph 3, The above first battery cell is provided in multiple numbers, and The above plurality of first battery cells are, A battery pack arranged along the length direction of the second battery cell.

5. In Paragraph 1, The first battery cell above is, A battery pack having a rectangular shape.

6. In Paragraph 1, A battery pack further comprising a first interbusbar that physically and electrically connects the first battery cell and the battery unit.

7. In Paragraph 6, The first battery cell above is, It includes power terminals located on the upper surface, and The above-mentioned first interbusbar is, A battery pack physically connected to the power terminal and the battery unit.

8. In Paragraph 1, The above pack case is, It further includes a side wall installed on the upper surface of the base plate and having a first receiving groove on its inner surface, and A portion of the above-mentioned first battery cell is, A battery pack accommodated in the first receiving groove above.

9. In Paragraph 1, The above pack case further includes a partition wall that partitions the internal space and has a second receiving groove, and A portion of the above-mentioned first battery cell is, A battery pack accommodated in the second receiving groove above.

10. In Paragraph 1, The above first battery cell is provided in multiple numbers, and The above battery unit is a battery pack disposed between the plurality of first battery cells.

11. In Paragraph 1, It further includes a bracket that provides a receiving space and has an open top surface, and The first battery cell above is, A battery pack accommodated in the above bracket.

12. In Paragraph 11, The above first battery cell is provided in multiple numbers, and The above battery pack is, A battery pack further comprising a second interbusbar electrically connecting the plurality of first battery cells.

13. In Paragraph 11, The above pack case is, It further includes a side wall installed on the upper surface of the base plate, and The above bracket is, A battery pack comprising a first coupling portion coupled to the side wall.

14. In Paragraph 13, The internal space of the above-mentioned pack case is partitioned, and further includes a partition wall facing the above-mentioned side wall, The above bracket is, A battery pack further comprising a second coupling portion coupled to the partition wall.

15. In Paragraph 14, The above battery unit is, A battery pack placed between the above side wall and the above partition wall.

16. An automobile comprising a battery pack according to any one of claims 1 to 15.

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