Battery pack

Abstract

A battery pack is disclosed. The battery pack according to an embodiment of the present invention may comprise: a bottom cover assembly; a battery module installed on the upper surface of the bottom cover assembly; a top cover assembly positioned above the battery module, having a flow path formed therein, and comprising injection holes communicating with the flow path and facing the battery module; hole covers coupled to the lower surface of the top cover assembly and for sealing the injection holes; and a support fixed between the hole covers and the battery module and supporting the hole covers.

Description

battery pack

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

[0002] This application is a priority application for Korean Patent Application No. 10-2024-0153821 filed on November 1, 2024 and Korean Patent Application No. 10-2025-0012472 filed on January 31, 2025, and all contents disclosed in the specification 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 secondary batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium secondary batteries. Among these, lithium secondary 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 secondary 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] In particular, if an event such as thermal runaway occurs in a single battery module, gases or flames may be randomly released to the outside. If the release of such gases or flames is not properly controlled, they may be released toward other battery modules, potentially causing a thermal chain reaction in those modules. Specifically, module terminals may be located on the front side of a battery module to provide electrical connections to other battery modules or battery packs, such as module busbars. Therefore, if flames are released toward the front of such a battery module, they can damage the module terminals within the battery pack and cause an electrical short circuit. Furthermore, since other battery modules may be located in front of a specific battery module, if flames are released toward the front of that module, the emitted flames may spread toward other modules, making it easy for fire to spread between battery modules.

[0010] If thermal propagation between battery modules or between battery cells is not properly controlled, a rapid voltage drop in the battery module or battery pack may occur. This can lead to a sudden shutdown of the device equipped with the battery module or battery pack, causing unexpected damage. For example, if a sudden voltage drop in the battery pack occurs while an electric vehicle is in operation, there may not be enough time to move the electric vehicle to a safe location.

[0011] Furthermore, if thermal propagation between battery modules or battery cells is not properly controlled and a fire or explosion occurs suddenly, there is a high possibility of causing casualties to users. For example, if thermal runaway occurs in an electric vehicle and a certain amount of time is not secured before it progresses into a full-scale fire, the occupants may not be able to escape safely.

[0012] 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 appropriately controlling the discharge of flames, etc. generated inside the battery module, and a vehicle including the same.

[0013] In addition, the present invention may aim to provide a structure capable of rapidly injecting cooling liquid into a battery module when a thermal event occurs.

[0014] In addition, the present invention may aim to provide a structure capable of suppressing heat propagation between battery cells or battery modules.

[0015] In addition, the present invention can provide a structure that reinforces the rigidity of the part injecting the cooling liquid to prevent damage or deformation caused by the pressure of the cooling liquid.

[0016] 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.

[0017] A battery pack according to one embodiment of the present invention for achieving the above-mentioned purpose may include: a bottom cover assembly; a battery module installed on the upper surface of the bottom cover assembly; a top cover assembly positioned above the battery module, the top cover assembly having a fluid path formed therein and an injection hole communicating with the fluid path and facing the battery module; a hole cover coupled to the lower surface of the top cover assembly and sealing the injection hole; and a support fixed between the hole cover and the battery module and supporting the hole cover.

[0018] In addition, the hole cover may have a sheet shape.

[0019] In addition, the support may include a material having elasticity.

[0020] In addition, the support can be compressed between the hole cover and the battery module.

[0021] In addition, the support may include a metal material.

[0022] In addition, the battery module comprises: a module case having a top plate and providing an internal space; and a battery cell located inside the module case, and the support can be coupled to the upper surface of the top plate.

[0023] In addition, the support and the top plate can be formed integrally.

[0024] In addition, the support may have a connecting hole facing the hole cover.

[0025] In addition, when a thermal event occurs, the injection hole and the connection hole may be configured to be in communication.

[0026] In addition, the battery module comprises: a module case having a top plate and providing an internal space; and a battery cell located inside the module case, wherein the top plate may have an inlet hole communicating with the injection hole.

[0027] In addition, the injection hole may include a portion whose diameter increases toward the top.

[0028] Additionally, the top cover assembly comprises: a lower plate having an injection hole formed therein; and an upper plate positioned above the lower plate, and the space between the injection hole and the upper surface of the lower plate may be filleted or chamfered.

[0029] An automobile according to one aspect of the present invention includes a battery pack of the present invention.

[0030] According to at least one of the embodiments of the present invention, when a thermal event occurs, a cooling liquid can be rapidly injected into the interior of the battery module.

[0031] According to at least one of the embodiments of the present invention, deformation or damage to the part injecting the cooling liquid can be prevented due to the pressure of the cooling liquid.

[0032] According to at least one of the embodiments of the present invention, the electrical safety of the battery pack can be improved.

[0033] According to at least one of the embodiments of the present invention, heat propagation between battery modules can be suppressed when a thermal event occurs.

[0034] 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.

[0035] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention.

[0036] Figure 2 is a diagram showing a partial configuration of the battery pack of Figure 1 separated.

[0037] Figure 3 is a diagram showing a partial configuration of the battery pack of Figure 2 separated.

[0038] Figure 4 is a drawing showing the top cover assembly of Figure 3.

[0039] Figure 5 is a diagram showing a partial configuration of the top cover assembly of Figure 4 separated.

[0040] Figure 6 is an enlarged view of section C of Figure 5.

[0041] Fig. 7 is a bottom perspective view of Fig. 5.

[0042] FIG. 8 is a bottom perspective view of the top cover assembly of FIG. 4.

[0043] Figure 9 is a drawing showing the cross-sectional configuration along the cutting line D-D' of Figure 4.

[0044] Figure 10 is a drawing showing the cross-sectional configuration along the cutting line E-E' of Figure 4.

[0045] Figure 11 is a drawing showing the battery module of Figure 3.

[0046] FIG. 12 is a diagram showing a partial configuration of the battery module of FIG. 11 separated.

[0047] Figure 13 is a diagram showing a part of the configuration of the battery pack of Figure 3.

[0048] FIG. 14 is a drawing showing the cross-sectional configuration along the cutting line F-F' of FIG. 13.

[0049] Figure 15 is a drawing showing the support of Figure 3.

[0050] Figure 16 is a drawing showing the cross-sectional configuration along the cutting line H-H' of Figure 15.

[0051] Figure 17 is a drawing showing the cross-sectional configuration along the cutting line I-I' of Figure 15.

[0052] FIG. 18 is a drawing showing the cross-sectional configuration along the cutting line A-A' of FIG. 1.

[0053] Figure 19 is a drawing showing the cross-sectional configuration of Figure 18 filled with cooling liquid.

[0054] Figure 20 is a diagram showing the change in Figure 18 when a thermal event occurs.

[0055] FIG. 21 is a drawing showing a cross-sectional configuration along the cutting line B-B' of FIG. 1.

[0056] Figure 22 is a drawing showing the cross-sectional configuration of Figure 21 filled with cooling liquid.

[0057] Figure 23 is a diagram showing the change in Figure 22 when a thermal event occurs.

[0058] FIG. 24 is a drawing showing a vehicle according to one aspect of the present invention.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] Referring to FIGS. 1 to 3, the case (100) may provide an internal space. The case (100) may include a bottom cover assembly (110). The bottom cover assembly (110) may have a rectangular shape. The bottom cover assembly (110) may have a flat shape. The bottom cover assembly (110) may form the exterior of the battery pack (1000). The bottom cover assembly (110) may provide an internal space for the battery pack (1000).

[0063] The case (100) may include a side wall (120). The side wall (120) may be installed, fastened, fixed, joined, or attached to the upper surface of the bottom cover assembly (110). The side wall (120) may be provided along the perimeter of the bottom cover assembly (110). For example, the side wall (120) may be composed of four. The side wall (120) may provide an internal space for the battery pack (1000).

[0064] The case (100) may include a top cover assembly (150). The top cover assembly (150) may have a square plate shape. The top cover assembly (150) may have a flat plate shape. The top cover assembly (150) may form the exterior of the battery pack (1000). The top cover assembly (150) may cover the internal space of the battery pack (1000). The top cover assembly (150) may be installed, fastened, fixed, coupled, or attached to the side wall (120).

[0065] A battery pack (1000) according to one embodiment of the present invention may include partition walls (300). Partition walls (300) may be provided in plurality. Partition walls (300) may be installed, fastened, fixed, coupled, or attached to the upper surface of a bottom cover assembly (110). Partition walls (300) may partition the internal space of the battery pack (1000). Partition walls (300) may extend along the front-rear direction or the X-axis direction. A plurality of partition walls (300) may be arranged along the left-right direction or the Y-axis direction.

[0066] A battery pack (1000) according to one embodiment of the present invention may include an installation beam (400). The installation beam (400) may be provided in multiple numbers. The installation beam (400) may be installed, fastened, fixed, coupled, or attached to the upper surface of a bottom cover assembly (110). The installation beam (400) may partition the internal space of the battery pack (1000). The installation beam (400) may extend along the left-right direction or the Y-axis direction. A plurality of installation beams (400) may be arranged along the front-rear direction or the X-axis direction.

[0067] The battery module (200) may be placed inside the case (100). The battery module (200) may be installed, fastened, fixed, coupled, or attached to the upper surface of the bottom cover assembly (110). The battery module (200) may be installed, fastened, fixed, coupled, or attached to the installation beam (400). The battery module (200) may be provided in multiple numbers. For example, the battery module (200) may be provided in four numbers. The battery module (200) may be located in the space partitioned by the partition wall (300).

[0068] 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 discharge gas when the pressure inside the case (100) increases. Additionally, the venting device (500) may block external air from entering the interior of the case (100). Multiple venting devices (500) may be provided.

[0069] A hole cover (155) can be placed between the top cover assembly (150) and the battery module (200). A hole cover (155) can be provided for each battery module (200). For example, four hole covers (155) can be provided.

[0070] A heat transfer member (800) may be positioned between the top cover assembly (150) and the battery module (200). A heat transfer member (800) may be provided for each battery module (200). For example, the heat transfer member (800) may be made of a material with high thermal conductivity. For example, the heat transfer member (800) may be resin.

[0071] FIG. 4 is a drawing showing the top cover assembly (150) of FIG. 3. FIG. 5 is a drawing showing a partial configuration of the top cover assembly (150) of FIG. 4 separated. FIG. 6 is an enlarged drawing of section C of FIG. 5. FIG. 7 is a bottom perspective view of FIG. 5. FIG. 8 is a bottom perspective view of the top cover assembly (150) of FIG. 4.

[0072] Referring to FIGS. 4 through 8, the top cover assembly (150) may include an upper plate (151) and a lower plate (152). The upper plate (151) may have a square shape. The upper plate (151) may form the exterior of the battery pack (1000). The lower plate (152) may have a square shape. The lower plate (152) may form the exterior of the battery pack (1000). The upper plate (151) may be placed on top of the lower plate (152). The top cover assembly (150) may include a cooling channel (153) inside. The cooling channel (153) may be placed between the upper plate (151) and the lower plate (152). The top cover assembly (150) may include an injection hole (154). An injection hole (154) may be formed in the lower plate (152). The injection hole (154) may be in communication with the cooling channel (153). Multiple injection holes (154) may be provided. The injection holes (154) may extend along the front-rear direction or the X-axis direction. Multiple injection holes (154) may be arranged along the left-right direction or the Y-axis direction.

[0073] The top cover assembly (150) may include a hole cover (155). The hole cover (155) may be attached, coupled, fastened, or fixed to the lower surface of the lower plate (152). For example, the hole cover (155) may be fused to the lower surface of the lower plate (152). The hole cover (155) may seal an injection hole (154). The hole cover (155) may seal a plurality of injection holes (154). The hole cover (155) may have a square shape. The hole cover (155) may have a sheet shape. The hole cover (155) may be provided in multiple numbers. The hole cover (155) may be provided to correspond one-to-one with the battery module (200).

[0074] The hole cover (155) may include a polymer material. For example, the hole cover (155) may include a material having a melting point of 170 degrees or less. For example, the hole cover (155) may include a PLA (Poly Lactic Acid) material.

[0075] FIG. 9 is a drawing showing a cross-sectional configuration along the cutting line D-D' of FIG. 4. FIG. 10 is a drawing showing a cross-sectional configuration along the cutting line E-E' of FIG. 4.

[0076] Referring to FIGS. 9 and 10, the injection hole (154) may have a square shape. The periphery (154a) of the injection hole (154) may have a curved surface. The diameter of the injection hole (154) may increase as it moves toward the +Z axis or upward. For example, the diameter (Dx) of the injection hole (154) in the front-back direction or X-axis direction may increase as it moves upward. For example, the diameter (Dy) of the injection hole (154) in the left-right direction or Y-axis direction may increase as it moves toward the +Z axis or upward.

[0077] FIG. 11 is a drawing showing the battery module (200) of FIG. 3. FIG. 12 is a drawing showing a partial configuration of the battery module (200) of FIG. 11 separated.

[0078] Referring to FIGS. 11 and 12, the module case (210) may have a rectangular shape. The module case (210) may form the exterior of the battery module (200). The module case (210) may provide space inside. The module case (210) may include an upper frame (211) and a lower frame (212).

[0079] The upper frame (211) may include a top plate (211a). The top plate (211a) may have an inlet hole (211b). The inlet hole (211b) may extend along the front-rear direction or the X-axis direction. The inlet hole (211b) may be provided in multiple numbers. The multiple inlet holes (211b) may be arranged along the left-right direction or the Y-axis direction.

[0080] The upper frame (211) may include a first side plate (211c). The first side plate (211c) may be provided as a pair. The first side plate (211c) may be provided on the left and right sides, respectively, of the top plate (211a). The first side plate (211c) may extend downward from the top plate (211a).

[0081] The upper frame (211) may include a first end plate (211d). The first end plate (211d) may be provided as a pair. The first end plate (211d) may be provided on the front side and the rear side of the top plate (211a), respectively. The first end plate (211d) may extend downward from the top plate (211a).

[0082] The lower frame (212) may include a bottom plate (212a). The bottom plate (212a) may have a venting hole (212b). The venting hole (212b) may extend along the front-rear direction or the X-axis direction. The venting hole (212b) may be provided in multiple numbers. The multiple venting holes (212b) may be arranged along the left-right direction or the Y-axis direction.

[0083] The lower frame (212) may include a second side plate (212c). The second side plate (212c) may be provided as a pair. The second side plate (212c) may be provided on the left and right sides of the bottom plate (212a), respectively. The second side plate (212c) may extend upward from the bottom plate (212a).

[0084] The lower frame (212) may include a second end plate (212d). The second end plate (212d) may be provided as a pair. The second end plate (212d) may be provided on the front side and the rear side of the bottom plate (212a), respectively. The second end plate (212d) may extend upward from the bottom plate (212a).

[0085] The upper frame (211) and the lower frame (212) may be joined, fastened, attached, or assembled. The first side plate (211c) may be located on the outside of the second side plate (212c). The first end plate (211d) may be located on the outside of the second end plate (212d). The top plate (211a) and the bottom plate (212a) may face each other.

[0086] A battery cell (220) can be accommodated inside a module case (210). A plurality of battery cells (220) may be provided. A battery cell (220) may refer to a secondary battery. In particular, a battery cell (220) may be a pouch-type secondary battery. However, the shape of the battery cell (220) is not limited to a pouch shape and may have various shapes, such as a cylindrical shape or a rectangular shape.

[0087] The battery cell (220) may be extended along the front-rear direction or the X-axis direction. The battery cell (220) may be provided with a cell case (220a) that provides space inside. The cell case (220a) may include a storage portion (221) having an electrode assembly, a first sealing portion (222) protruding to the front and rear sides of the storage portion (221), respectively, and a second sealing portion (223) protruding downward from the storage portion (221). The first sealing portion (222) and the second sealing portion (223) may be formed by joining or attaching the cell case (220a). The top of the storage portion (221) may be referred to as a folding portion (226). The folding portion (226) may be formed by folding the cell case (220a). Additionally, the battery cell (220) may include electrode leads (224) that protrude to the front and rear sides, respectively, of the first sealing portion (222). The electrode leads (224) may protrude to the front and rear of each battery cell (220). A plurality of battery cells (220) may be stacked along the left-right direction or the Y-axis direction. The battery cell (220) may include an adhesive member (225) that folds and fixes the second sealing portion (223) to the storage portion (221). The adhesive member (225) may press the second sealing portion (223) against the storage portion (221). A plurality of adhesive members (225) may be provided. A plurality of adhesive members (225) may be arranged along the front-rear direction or the X-axis direction.

[0088] A barrier (250) may be placed between multiple battery cells (220). The barrier (250) may be placed between at least some of the battery cells (220) and / or outside the stack. For example, the barrier (250) may be configured to be placed between every two battery cells (220) stacked in the left-right direction.

[0089] Such barriers (250) may be provided with an elastic material to enable absorption of swelling of the battery cells (220). For example, the barrier (250) may be composed of a foam material such as polyurethane. Alternatively, the barrier (250) may be provided with a material capable of blocking heat or flames. For example, the barrier (250) may be provided with an insulating or fireproof material such as silicone or mica.

[0090] A front busbar frame assembly (230) may be provided in front of a plurality of battery cells (220). The front busbar frame assembly (230) may be electrically connected to the front side electrode leads (224) of the plurality of battery cells (220).

[0091] A rear busbar frame assembly (230) may be provided at the rear of a plurality of battery cells (220). The rear busbar frame assembly (230) may be electrically connected to the rear side electrode leads (224) of the plurality of battery cells (220). The rear busbar frame assembly (230) may include a power terminal (231).

[0092] FIG. 13 is a drawing showing a partial configuration of the battery pack (1000) of FIG. 3. FIG. 14 is a drawing showing a cross-sectional configuration along the cutting line F-F' of FIG. 13.

[0093] Referring to FIGS. 13 and 14, a bottom cover assembly (110) may form the exterior of a battery pack (1000). The bottom cover assembly (110) may have a rectangular shape. The bottom cover assembly (110) may include a venting channel (111) inside. The bottom cover assembly (110) may include a discharge hole (112). The discharge hole (112) may be formed on the upper surface of the bottom cover assembly (110). The discharge hole (112) may be in communication with the venting channel (111). The discharge hole (112) may be provided in multiple numbers. The discharge hole (112) may extend along the front-rear direction or the X-axis direction. The multiple discharge holes (112) may be arranged along the left-right direction or the Y-axis direction. The discharge hole (112) may be provided to correspond one-to-one with the venting hole (212b). The discharge hole (112) can have substantially the same size as the venting hole (212b).

[0094] The venting channel (111) may be in communication with the interior of the side wall (120). The interior of the side wall (120) may be in communication with the venting device (500). When a thermal event occurs, the venting gas (G) generated from the battery cell (220) may be discharged through the venting hole (212b) of the battery module (200) to the discharge hole (112) and the venting channel (111). The venting gas (G) may flow along the venting channel (111) toward the venting device (500). The venting gas (G) may be discharged to the outside of the battery pack (1000) through the venting device (500).

[0095] FIG. 15 is a drawing showing the support (600) of FIG. 3. FIG. 16 is a drawing showing the cross-sectional configuration along the cutting line H-H' of FIG. 15. FIG. 17 is a drawing showing the cross-sectional configuration along the cutting line I-I' of FIG. 15.

[0096] Referring to FIGS. 15 to 17, the support (600) may include a first part (610). The first part (610) may have a square shape. The connecting hole (611) may extend along the front-rear direction or the X-axis direction. The connecting hole (611) may be provided in multiple numbers. The multiple connecting holes (611) may be arranged along the left-right direction or the Y-axis direction.

[0097] The second part (620) may extend from the first part (610). The second part (620) may extend along the perimeter of the upper surface of the battery module (200). The second part (620) may extend along the perimeter of the top plate (211a). The support (600) may have a pair of openings (601). Each opening (601) may be surrounded by the second part (620) and the first part (610). The first part (610) may be located between the pair of openings (601). Each opening (601) may have a square shape.

[0098] The support (600) may be formed integrally. The first part (610) and the second part (620) may be formed integrally. The support (600) may include an elastic material. For example, the support (600) may include a silicone material. Alternatively, the support (600) may include a metal material. For example, the support (600) may include an aluminum material.

[0099] FIG. 18 is a diagram showing a cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 19 is a diagram showing the cross-sectional configuration of FIG. 18 filled with a cooling liquid (CL). FIG. 20 is a diagram showing the change in FIG. 18 when a thermal event occurs. FIG. 21 is a diagram showing a cross-sectional configuration along the cutting line B-B' of FIG. 1. FIG. 22 is a diagram showing the cross-sectional configuration of FIG. 21 filled with a cooling liquid (CL). FIG. 23 is a diagram showing the change in FIG. 22 when a thermal event occurs.

[0100] Referring to FIGS. 18 through 23, the support (600) can be attached to the upper surface of the battery module (200). The support (600) can be attached to the upper surface of the top plate (211a). The support (600) can be attached to the lower surface of the top cover assembly (150). The support (600) can be attached to the lower surface of the lower plate (152).

[0101] If the support (600) is made of a metal material, the support (600) can be joined to the upper surface of the battery module (200) by brazing welding. If the support (600) is made of a metal material, the support (600) can be joined to the upper surface of the top plate (211a) by brazing welding. If the support (600) is made of a metal material, the support (600) can be joined to the lower surface of the top cover assembly (150) by brazing welding. If the support (600) is made of a metal material, the support (600) can be joined to the lower surface of the lower plate (152) by brazing welding.

[0102] If the support (600) includes a metal material, the support (600) may be formed integrally with the battery module (200).

[0103] The hole cover (155) can seal the injection hole (154). The interior of the cooling channel (153) can be filled with a cooling liquid (CL). The cooling liquid (CL) can flow along the cooling channel (153). For example, the cooling liquid (CL) can be water. The hole cover (155) can seal the injection hole (154) so ​​that the cooling liquid (CL) does not leak through the injection hole (154).

[0104] The injection hole (154) may face the connection hole (611). A hole cover (155) may be placed between the injection hole (154) and the connection hole (611). A support (600) may be placed on the lower surface of the hole cover (155).

[0105] The support (600) can be fixed between the top cover assembly (150) and the battery module (200). The support (600) can be fixed between the lower plate (152) and the top plate (211a) of the top cover assembly (150). The first part (610) can be fixed between the hole cover (155) and the top plate (211a) of the top cover assembly (150). The first part (610) can be compressed between the hole cover (155) and the top plate (211a). The support (600) can support the hole cover (155). The first part (610) can support the hole cover (155).

[0106] The hole cover (155) can receive pressure (P) from the cooling liquid (CL) flowing through the cooling channel (153). The first part (610) can support the hole cover (155). The first part (610) can provide support force (S) to the hole cover (155). By supporting the hole cover (155), the first part (610) can prevent the hole cover (155) from sagging or deforming due to the pressure (P) of the cooling liquid (CL). Due to the first part (610), the hole cover (155) can stably seal the injection hole (154).

[0107] The injection hole (154) may face the connection hole (611). A hole cover (155) may be placed between the injection hole (154) and the connection hole (611). A support (600) may be placed on the lower surface of the hole cover (155).

[0108] The connecting hole (611) may face the inlet hole (211b). The connecting hole (611) may be in communication with the inlet hole (211b). The connecting hole (611) may have substantially the same size as the inlet hole (211b). The diameter of the connecting hole (611) may be substantially the same as the diameter of the inlet hole (211b).

[0109] The connection hole (611) may have substantially the same size as the injection hole (154). The diameter of the connection hole (611) may be substantially the same as the diameter of the injection hole (154). As a result, the hole cover (155) can be easily melted or damaged in the event of a thermal event. By melting or damaging the hole cover (155), the injection hole (154), the connection hole (611), and the inlet hole (211b) can be connected. Cooling liquid (CL) can be introduced into the interior of the battery module (200) through the injection hole (154), the connection hole (611), and the inlet hole (211b). As a result, the battery cell (220) in which a thermal event has occurred can be rapidly cooled. Alternatively, the battery cell (220) in which a fire has occurred can be rapidly extinguished.

[0110] A heat transfer member (800) may be positioned between the battery module (200) and the top cover assembly (150). The heat transfer member (800) may be in contact with, coupled with, or attached to the battery module (200). The heat transfer member (800) may be in contact with, coupled with, or attached to the top cover assembly (150).

[0111] A heat transfer member (800) may be placed between the top plate (211a) and the lower plate (152). The heat transfer member (800) may be in contact with, coupled with, or attached to the top plate (211a). The heat transfer member (800) may be in contact with, coupled with, or attached to the lower plate (152). The heat transfer member (800) may be placed in the opening (601). For example, the heat transfer member (800) may be resin. The first part (610) and the second part (620) may limit the filling area of ​​the heat transfer member (800). The heat transfer member (800) may be surrounded by the first part (610) and the second part (620). Heat generated from the battery module (200) may be transferred to the top cover assembly (150) through the heat transfer member (800).

[0112] The periphery (154a) of the injection hole (154) may have a curved surface. By having the periphery (154a) have a curved surface, flow friction can be reduced when the cooling liquid (CL) passes through the injection hole (154). As a result, the pressure applied to the hole cover (155) can be relieved, and deformation or damage to the hole cover (155) can be reduced.

[0113] The diameter of the injection hole (154) can increase upward. As the diameter of the injection hole (154) increases upward, flow friction can be reduced when the cooling liquid (CL) passes through the injection hole (154). As a result, the pressure applied to the hole cover (155) can be relieved, and deformation or damage to the hole cover (155) can be reduced.

[0114] The periphery (154a) of the injection hole (154) may have a filleted shape. By filleting the periphery (154a), flow friction can be reduced when the cooling liquid (CL) passes through the injection hole (154). As a result, the pressure applied to the hole cover (155) can be relieved, and deformation or damage to the hole cover (155) can be reduced.

[0115] The periphery (154a) of the injection hole (154) may have a chamfered shape. By chamfering the periphery (154a), flow friction can be reduced when the cooling liquid (CL) passes through the injection hole (154). As a result, the pressure applied to the hole cover (155) can be relieved, and deformation or damage to the hole cover (155) can be reduced.

[0116] FIG. 24 is a drawing showing a vehicle (V) according to one aspect of the present invention.

[0117] Referring to FIG. 24, the battery pack (1000) according to the present invention can be applied to a vehicle (V), such as an electric vehicle or a hybrid vehicle. That is, the vehicle (V) according to the present invention may include the battery pack (1000) according to the present invention. In addition, 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, a control device such as an ECU (electronic control unit), etc.

[0118] 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. Bottom cover assembly; A battery module installed on the upper surface of the above-mentioned bottom cover assembly; A top cover assembly positioned above the battery module, comprising a fluid channel formed inside and an injection hole communicating with said fluid channel and facing said battery module; A hole cover coupled to the lower surface of the top cover assembly and sealing the injection hole; and, A battery pack including a support that is fixed between the hole cover and the battery module and supports the hole cover.

2. In Paragraph 1, The above hole cover is, Battery pack having a sheet shape.

3. In Paragraph 1, The above support is, A battery pack containing a material having elasticity.

4. In Paragraph 3, The above support is, A battery pack compressed between the above hole cover and the above battery module.

5. In Paragraph 1, The above support is, A battery pack containing metal material.

6. In Paragraph 1, The above battery module is: A modular case that provides internal space and is equipped with a top plate; and, It includes a battery cell located inside the above module case, and The above support is, A battery pack coupled to the upper surface of the top plate.

7. In Paragraph 6, A battery pack in which the above support and the above top plate are integrally formed.

8. In Paragraph 1, The above support is, A battery pack having a connecting hole facing the hole cover.

9. In Paragraph 8, A battery pack configured such that the injection hole and the connection hole communicate when a thermal event occurs.

10. In Paragraph 8, The above battery module is: A modular case that provides internal space and is equipped with a top plate; and, It includes a battery cell located inside the above module case, and The above top plate is, A battery pack having an inlet hole communicating with the injection hole above.

11. In Paragraph 1, The injection hole above is, A battery pack including a section whose diameter increases toward the top.

12. In Paragraph 1, The above top cover assembly is: A lower plate with an injection hole formed therein; and, It includes an upper plate positioned on top of the lower plate, and The space between the injection hole and the upper surface of the lower plate is, Battery pack that is filleted or chamfered.

13. An automobile comprising a battery pack according to any one of claims 1 to 12.

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