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; and hole covers fixed between the top cover assembly and the battery module and for sealing the injection holes.

Description

battery pack

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

[0002] This application is a priority application for Korean Patent Application No. 10-2024-0153834 filed on November 1, 2024 and Korean Patent Application No. 10-2025-0011868 filed on January 24, 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 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 charge and discharge freely 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] 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 emission 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; and a hole cover fixed between the top cover assembly and the battery module and sealing the injection hole.

[0018] In addition, the hole cover can be coupled to the upper surface of the battery module.

[0019] In addition, the hole cover can be coupled to the lower surface of the top cover assembly.

[0020] Additionally, the hole cover comprises a sealing portion facing the injection hole; and a first part extending from the sealing portion and surrounding the sealing portion, wherein the thickness of the sealing portion may be thinner than the thickness of the first part.

[0021] In addition, the battery pack may further include a first reinforcing member disposed on the lower surface of the sealing portion.

[0022] In addition, the first reinforcing member may have a plate shape.

[0023] In addition, the first reinforcing member may have a mesh shape.

[0024] In addition, the hole cover has a connecting hole formed in the sealing portion and facing the injection hole, and the first reinforcing member can seal the connecting hole.

[0025] In addition, the sealing part and the first reinforcing member may be formed integrally.

[0026] In addition, the battery pack may further include a second reinforcing member disposed on the upper surface of the sealing portion.

[0027] In addition, the sealing part and the second reinforcing member may be formed integrally.

[0028] Additionally, the hole cover further includes a reinforcing member extending along the perimeter of the injection hole, and the thickness of the reinforcing member may be thinner than the thickness of the first part and thicker than the thickness of the sealing member.

[0029] 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 facing the sealing portion.

[0030] In addition, the battery pack may be configured so that the injection hole and the inlet hole are connected when a thermal event occurs.

[0031] Additionally, the battery module may further include a support formed on the upper surface of the top plate, partitioning the inlet hole, and supporting the first reinforcing member.

[0032] In addition, the support and the top plate can be formed integrally.

[0033] In addition, the hole cover has a groove formed on the lower surface of the first part, and the support can be received in the groove.

[0034] Additionally, the hole cover has an opening that exposes the upper surface of the battery module, and the battery pack may further include a heat transfer member disposed in the opening and in contact with the lower surface of the top cover assembly and the upper surface of the battery module.

[0035] Additionally, the hole cover may further include a second part extending along the perimeter of the upper surface of the battery module.

[0036] An automobile according to one aspect of the present invention includes a battery pack of the present invention.

[0037] 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.

[0038] 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.

[0039] According to at least one of the embodiments of the present invention, the electrical safety of the battery pack can be improved.

[0040] 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.

[0041] 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.

[0042] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention.

[0043] Figure 2 is a diagram showing a partial configuration of the battery pack of Figure 1 separated.

[0044] Figure 3 is a diagram showing a partial configuration of the battery pack of Figure 2 separated.

[0045] Figure 4 is a drawing showing the top cover assembly of Figure 3.

[0046] Fig. 5 is a bottom perspective view of the top cover assembly of Fig. 4.

[0047] Figure 6 is a diagram showing a separated part of the top cover assembly of Figure 4.

[0048] Figure 7 is an enlarged view of section D of Figure 6.

[0049] Figure 8 is a drawing showing the battery module of Figure 3.

[0050] Figure 9 is a diagram showing a partial configuration of the battery module of Figure 8 separated.

[0051] Figure 10 is a diagram showing a part of the configuration of the battery pack of Figure 3.

[0052] Figure 11 is a drawing showing the cross-sectional configuration along the cutting line E-E' of Figure 10.

[0053] Figure 12 is a drawing showing the hole cover of Figure 3.

[0054] Figure 13 is a drawing showing the cross-sectional configuration along the cutting line H-H' of Figure 12.

[0055] Figure 14 is a drawing showing the cross-sectional configuration along the cutting line I-I' of Figure 12.

[0056] FIG. 15 is a drawing showing the hole cover and the first reinforcing member of FIG. 12.

[0057] FIG. 16 is a drawing showing the combination of the hole cover of FIG. 15 and the first reinforcing member.

[0058] FIG. 17 is a drawing showing the cross-sectional configuration along the cutting line A-A' of FIG. 1.

[0059] Figure 18 is a drawing showing the cross-sectional configuration of Figure 17 filled with cooling liquid.

[0060] Figure 19 is a diagram showing the change in Figure 18 when a thermal event occurs.

[0061] FIG. 20 is a drawing showing a cross-sectional configuration along the cutting line B-B' of FIG. 1.

[0062] Figure 21 is a drawing showing the cross-sectional configuration of Figure 20 filled with cooling liquid.

[0063] Figure 22 is a diagram showing the change in Figure 21 when a thermal event occurs.

[0064] FIG. 23 is a drawing showing the hole cover and the first reinforcing member separated according to another embodiment of the present invention.

[0065] FIG. 24 is a drawing showing the combination of the hole cover of FIG. 23 and the first reinforcing member.

[0066] FIG. 25 is a drawing showing another embodiment of the cross-sectional configuration according to the cutting line A-A' of FIG. 1.

[0067] FIG. 26 is a drawing showing another embodiment of the cross-sectional configuration according to the cutting line B-B' of FIG. 1.

[0068] FIG. 27 is a drawing showing the hole cover and the second reinforcing member separated according to another embodiment of the present invention.

[0069] FIG. 28 is a drawing showing the combination of the hole cover of FIG. 27 and the second reinforcing member.

[0070] FIG. 29 is a drawing showing another embodiment of the cross-sectional configuration according to the cutting line A-A' of FIG. 1.

[0071] FIG. 30 is a drawing showing another embodiment of the cross-sectional configuration according to the cutting line B-B' of FIG. 1.

[0072] FIG. 31 is a drawing showing a hole cover and a first reinforcing member according to another embodiment of the present invention.

[0073] FIG. 32 is a drawing showing the hole cover and the first reinforcing member of FIG. 31 separated.

[0074] FIG. 33 is a drawing showing the combination of the hole cover of FIG. 32 and the first reinforcing member.

[0075] FIG. 34 is a drawing showing another embodiment of the cross-sectional configuration according to the cutting line A-A' of FIG. 1.

[0076] FIG. 35 is a drawing showing another embodiment of the cross-sectional configuration according to the cutting line B-B' of FIG. 1.

[0077] FIG. 36 is a drawing showing a hole cover according to another embodiment of the present invention.

[0078] Fig. 37 is a bottom view of the hole cover of Fig. 36.

[0079] FIG. 38 is a drawing showing another embodiment of the cross-sectional configuration along the cutting line A-A' of FIG. 1.

[0080] FIG. 39 is a drawing showing another embodiment of the cross-sectional configuration according to the cutting line B-B' of FIG. 1.

[0081] FIG. 40 is a diagram showing a partial configuration of a battery pack according to another embodiment of the present invention.

[0082] FIG. 41 is a bottom perspective view of the hole cover and the first reinforcing member of FIG. 40.

[0083] FIG. 42 is a drawing showing another embodiment of the cross-sectional configuration according to the cutting line A-A' of FIG. 1.

[0084] FIG. 43 is a drawing showing an example of a cross-sectional configuration according to the cutting line C-C' of FIG. 1.

[0085] FIG. 44 is a drawing showing another embodiment of the cross-sectional configuration according to the cutting line B-B' of FIG. 1.

[0086] FIG. 45 is a drawing showing a vehicle according to one aspect of the present invention.

[0087] 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.

[0088] Therefore, it should be understood that 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, and that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0089] 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.

[0090] 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).

[0091] 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).

[0092] 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).

[0093] 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.

[0094] 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.

[0095] 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).

[0096] 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.

[0097] A hole cover (600) can be placed between the top cover assembly (150) and the battery module (200). A hole cover (600) can be provided for each battery module (200). For example, four hole covers (600) can be provided.

[0098] 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.

[0099] FIG. 4 is a drawing showing the top cover assembly (150) of FIG. 3. FIG. 5 is a bottom perspective view of the top cover assembly (150) of FIG. 4. FIG. 6 is a drawing showing a partial configuration of the top cover assembly (150) of FIG. 4 separated. FIG. 7 is an enlarged view of section D of FIG. 6.

[0100] Referring to FIGS. 4 through 7, 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.

[0101] FIG. 8 is a drawing showing the battery module (200) of FIG. 3. FIG. 9 is a drawing showing a partial configuration of the battery module (200) of FIG. 8 separated.

[0102] Referring to FIGS. 8 and 9, 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).

[0103] 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.

[0104] 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).

[0105] 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).

[0106] 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.

[0107] 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).

[0108] 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).

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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).

[0115] 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).

[0116] FIG. 10 is a drawing showing a partial configuration of the battery pack (1000) of FIG. 3. FIG. 11 is a drawing showing a cross-sectional configuration along the cutting line E-E' of FIG. 10.

[0117] Referring to FIGS. 10 and 11, 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).

[0118] 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).

[0119] FIG. 12 is a drawing showing the hole cover (600) of FIG. 3. FIG. 13 is a drawing showing the cross-sectional configuration along the cutting line H-H' of FIG. 12. FIG. 14 is a drawing showing the cross-sectional configuration along the cutting line I-I' of FIG. 12.

[0120] Referring to FIGS. 12 to 14, the hole cover (600) may include a first part (610) and a sealing part (630). The first part (610) and the sealing part (630) may be formed integrally. The first part (610) and the sealing part (630) may have a rectangular shape. The sealing part (630) may have a thinner thickness than the first part (610). The sealing part (630) may extend along the front-rear direction or the X-axis direction. The sealing part (630) may be provided in multiple numbers. The multiple sealing parts (630) may be arranged along the left-right direction or the Y-axis direction.

[0121] 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 hole cover (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) and the sealing part (630) may be located between the pair of openings (601). Each opening (601) may have a square shape.

[0122] The hole cover (600) may be formed integrally. The first part (610) and the second part (620) may be formed integrally. The hole cover (600) may include a plastic material. The hole cover (600) may include a plastic material with a low melting point. Alternatively, the hole cover (600) may include a metal material. The hole cover (600) may include a metal material with a low melting point. The sealing portion (630) has a thin thickness so that it can easily melt or break when exposed to heat.

[0123] The hole cover (600) can be attached to the upper surface of the battery module (200). The hole cover (600) can be attached to the upper surface of the top plate (211a). The hole cover (600) can be attached to the lower surface of the top cover assembly (150). The hole cover (600) can be attached to the lower surface of the lower plate (152).

[0124] If the hole cover (600) includes a plastic material, the hole cover (600) can be joined to the upper surface of the battery module (200) by heat fusion. If the hole cover (600) includes a plastic material, the hole cover (600) can be joined to the upper surface of the top plate (211a) by heat fusion. If the hole cover (600) includes a plastic material, the hole cover (600) can be adhered to the lower surface of the top cover assembly (150). If the hole cover (600) includes a plastic material, the hole cover (600) can be joined to the lower surface of the lower plate (152) by heat fusion.

[0125] If the hole cover (600) is made of a metal material, the hole cover (600) can be joined to the upper surface of the battery module (200) by brazing welding. If the hole cover (600) is made of a metal material, the hole cover (600) can be joined to the upper surface of the top plate (211a) by brazing welding. If the hole cover (600) is made of a metal material, the hole cover (600) can be joined to the lower surface of the top cover assembly (150) by brazing welding. If the hole cover (600) is made of a metal material, the hole cover (600) can be joined to the lower surface of the lower plate (152) by brazing welding.

[0126] FIG. 15 is a drawing showing the hole cover (600) and the first reinforcing member (710) of FIG. 12. FIG. 16 is a drawing showing the combination of the hole cover (600) and the first reinforcing member (710) of FIG. 15.

[0127] Referring to FIGS. 15 and 16, the first reinforcing member (710) may be coupled, attached, fastened, or fixed to the hole cover (600). The first reinforcing member (710) may be coupled, attached, fastened, or fixed to the lower surface of the sealing portion (630). The first reinforcing member (710) may be provided in multiple numbers. The first reinforcing member (710) may be provided to correspond one-to-one with the sealing portion (630). The first reinforcing member (710) may have a square plate shape. The first reinforcing member (710) and the sealing portion (630) may include the same material. The first reinforcing member (710) and the sealing portion (630) may be formed integrally.

[0128] FIG. 17 is a diagram showing a cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 18 is a diagram showing the cross-sectional configuration of FIG. 17 filled with a cooling liquid (CL). FIG. 19 is a diagram showing the change in FIG. 18 when a thermal event occurs. FIG. 20 is a diagram showing a cross-sectional configuration along the cutting line B-B' of FIG. 1. FIG. 21 is a diagram showing the cross-sectional configuration of FIG. 20 filled with a cooling liquid (CL). FIG. 22 is a diagram showing the change in FIG. 21 when a thermal event occurs.

[0129] Referring to FIGS. 17 to 22, the sealing portion (630) 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 sealing portion (630) can seal the injection hole (154) so ​​that the cooling liquid (CL) does not leak through the injection hole (154).

[0130] The injection hole (154) may face the inflow hole (211b). The sealing portion (630) may be positioned between the injection hole (154) and the inflow hole (211b). The first reinforcing member (710) may be positioned on the lower surface of the sealing portion (630).

[0131] The hole cover (600) can be fixed between the top cover assembly (150) and the battery module (200). The hole cover (600) can be fixed between the lower plate (152) and the top plate (211a) of the top cover assembly (150).

[0132] The sealing portion (630) can receive pressure (P) from the cooling liquid (CL) flowing through the cooling channel (153). The first reinforcing member (710) can support the sealing portion (630). The first reinforcing member (710) can provide support force (S) to the sealing portion (630). By supporting the sealing portion (630), the first reinforcing member (710) can prevent the sealing portion (630) from sagging or deforming due to the pressure (P) of the cooling liquid (CL). Due to the first reinforcing member (710), the sealing portion (630) can stably seal the injection hole (154).

[0133] The first reinforcing member (710) may have a size smaller than the injection hole (154). As a result, when a thermal event occurs, the sealing part (630) may easily melt or break. At this time, the first reinforcing member (710) may also melt or break. Alternatively, if the sealing part (630) melts or breaks, the first reinforcing member (710) may fall downward. As the sealing part (630) melts or breaks, the injection hole (154) and the inlet hole (211b) may be connected. Cooling liquid (CL) can flow into the interior of the battery module (200) through the injection hole (154) and the inlet hole (211b). As a result, the battery cell (220) where a thermal event has occurred can be cooled quickly. Alternatively, the battery cell (220) where a fire has occurred can be quickly extinguished.

[0134] 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).

[0135] 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).

[0136] FIG. 23 is a drawing showing a hole cover (600) and a first reinforcing member (710) separated according to another embodiment of the present invention. FIG. 24 is a drawing showing the combination of the hole cover (600) and the first reinforcing member (710) of FIG. 23. FIG. 25 is a drawing showing another embodiment of a cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 26 is a drawing showing another embodiment of a cross-sectional configuration along the cutting line B-B' of FIG. 1.

[0137] Referring to FIGS. 23 through 26, the first reinforcing member (710) may be coupled, attached, fastened, or fixed to the hole cover (600). The first reinforcing member (710) may be coupled, attached, fastened, or fixed to the lower surface of the sealing portion (630). The first reinforcing member (710) may be provided in multiple numbers. The first reinforcing member (710) may be provided to correspond one-to-one with the sealing portion (630). The first reinforcing member (710) may include a mesh structure. The first reinforcing member (710) and the sealing portion (630) may include the same material. The first reinforcing member (710) and the sealing portion (630) may be formed integrally.

[0138] The sealing portion (630) can receive pressure (P) from the cooling liquid (CL) flowing through the cooling channel (153). The first reinforcing member (710) can support the sealing portion (630). The first reinforcing member (710) can provide support force (S) to the sealing portion (630). By supporting the sealing portion (630), the first reinforcing member (710) can prevent the sealing portion (630) from sagging or deforming due to the pressure (P) of the cooling liquid (CL). Due to the first reinforcing member (710), the sealing portion (630) can stably seal the injection hole (154).

[0139] The first reinforcing member (710) has a mesh structure, so that it is lighter in weight compared to the plate shape and can stably support the sealing part (630).

[0140] The first reinforcing member (710) may have a size smaller than the injection hole (154). As a result, when a thermal event occurs, the sealing part (630) may easily melt or break. At this time, the first reinforcing member (710) may also melt or break. Alternatively, if the sealing part (630) melts or breaks, the first reinforcing member (710) may fall downward. As the sealing part (630) melts or breaks, the injection hole (154) and the inlet hole (211b) may be connected. Cooling liquid (CL) can flow into the interior of the battery module (200) through the injection hole (154) and the inlet hole (211b). As a result, the battery cell (220) where a thermal event has occurred can be cooled quickly. Alternatively, the battery cell (220) where a fire has occurred can be quickly extinguished.

[0141] FIG. 27 is a drawing showing a hole cover (600) and a second reinforcing member (720) separated according to another embodiment of the present invention. FIG. 28 is a drawing showing the combination of the hole cover (600) and the second reinforcing member (720) of FIG. 27. FIG. 29 is a drawing showing another embodiment of a cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 30 is a drawing showing another embodiment of a cross-sectional configuration along the cutting line B-B' of FIG. 1.

[0142] Referring to FIGS. 27 to 30, the second reinforcing member (720) may be coupled, attached, fastened, or fixed to the hole cover (600). The second reinforcing member (720) may be coupled, attached, fastened, or fixed to the upper surface of the sealing portion (630). The second reinforcing member (720) may be provided in multiple numbers. The second reinforcing member (720) may be provided to correspond one-to-one with the sealing portion (630). The second reinforcing member (720) may have a square plate shape. The second reinforcing member (720) and the sealing portion (630) may include the same material. The second reinforcing member (720) and the sealing portion (630) may be formed integrally.

[0143] The sealing portion (630) can seal the injection hole (154) so ​​that the cooling liquid (CL) does not leak through the injection hole (154). The injection hole (154) may face the inflow hole (211b). The sealing portion (630) may be positioned between the injection hole (154) and the inflow hole (211b).

[0144] The sealing portion (630) can receive pressure (P) from the cooling liquid (CL) flowing through the cooling channel (153). The second reinforcing member (720) can be located inside the injection hole (154). The second reinforcing member (720) can support the sealing portion (630). The second reinforcing member (720) can provide support force (S) to the sealing portion (630). By supporting the sealing portion (630), the second reinforcing member (720) can prevent the sealing portion (630) from sagging or deforming due to the pressure (P) of the cooling liquid (CL). Due to the second reinforcing member (720), the sealing portion (630) can stably seal the injection hole (154).

[0145] The second reinforcing member (720) may have a size smaller than the injection hole (154). As a result, when a thermal event occurs, the sealing part (630) may easily melt or break. At this time, the second reinforcing member (720) may also melt or break. Alternatively, if the sealing part (630) melts or breaks, the second reinforcing member (720) may fall downward. As the sealing part (630) melts or breaks, the injection hole (154) and the inlet hole (211b) may be connected. Cooling liquid (CL) can flow into the interior of the battery module (200) through the injection hole (154) and the inlet hole (211b). As a result, the battery cell (220) where a thermal event has occurred can be cooled quickly. Alternatively, the battery cell (220) where a fire has occurred can be quickly extinguished.

[0146] FIG. 31 is a drawing showing a hole cover (600) and a first reinforcing member (710) according to another embodiment of the present invention. FIG. 32 is a drawing showing the hole cover (600) and the first reinforcing member (710) of FIG. 31 separated. FIG. 33 is a drawing showing the combination of the hole cover (600) and the first reinforcing member (710) of FIG. 32. FIG. 34 is a drawing showing another embodiment of the cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 35 is a drawing showing another embodiment of the cross-sectional configuration along the cutting line B-B' of FIG. 1.

[0147] Referring to FIGS. 31 through 35, the sealing portion (630) may be provided with a connecting hole (602). The connecting hole (602) may face the injection hole (154). The first reinforcing member (710) may be coupled, attached, fastened, or fixed to the hole cover (600). The first reinforcing member (710) may be coupled, attached, fastened, or fixed to the lower surface of the sealing portion (630). The first reinforcing member (710) may seal the connecting hole (602). The first reinforcing member (710) may have a size larger than the connecting hole (602). The first reinforcing member (710) may be provided in multiple numbers. The first reinforcing member (710) may be provided to correspond one-to-one with the connecting hole (602). The first reinforcing member (710) may have a square plate shape. The first reinforcing member (710) and the sealing part (630) may be made of the same material. The first reinforcing member (710) and the sealing part (630) may also be formed integrally.

[0148] The sealing portion (630) can seal the injection hole (154) so ​​that the cooling liquid (CL) does not leak through the injection hole (154). The first reinforcing member (710) can seal the connection hole (602) so that the cooling liquid (CL) does not leak through the connection hole (602).

[0149] The sealing portion (630) can receive pressure (P) from the cooling liquid (CL) flowing through the cooling channel (153). The first reinforcing member (710) can support the sealing portion (630). The first reinforcing member (710) can provide support force (S) to the sealing portion (630). By supporting the sealing portion (630), the first reinforcing member (710) can prevent the sealing portion (630) from sagging or deforming due to the pressure (P) of the cooling liquid (CL). Due to the first reinforcing member (710), the sealing portion (630) can stably seal the injection hole (154).

[0150] When a thermal event occurs, the sealing portion (630) may easily melt or break. At this time, the first reinforcing member (710) may also melt or break. Alternatively, if the sealing portion (630) melts or breaks, the first reinforcing member (710) may fall downward. Due to the connection hole (602), the injection hole (154) can be opened more easily. Due to the connection hole (602), the first reinforcing member (710) can fall downward more easily. Due to the connection hole (602), the injection hole (154) and the inflow hole (211b) can be communicated more easily. As the sealing portion (630) melts or breaks, the connection hole (602), the injection hole (154), and the inflow hole (211b) can be communicated. Cooling liquid (CL) can be introduced into the interior of the battery module (200) through the injection hole (154) and the inflow hole (211b). As a result, the battery cell (220) where a thermal event occurred can be cooled quickly. Alternatively, the battery cell (220) where a fire occurred can be quickly extinguished.

[0151] FIG. 36 is a drawing showing a hole cover (600) according to another embodiment of the present invention. FIG. 37 is a bottom view of the hole cover (600) of FIG. 36. FIG. 38 is a drawing showing another embodiment of a cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 39 is a drawing showing another embodiment of a cross-sectional configuration along the cutting line B-B' of FIG. 1.

[0152] Referring to FIGS. 36 through 39, the hole cover (600) may include a reinforcing portion (640). The reinforcing portion (640) may be formed on the lower surface of the sealing portion (630). The reinforcing portion (640) may protrude from the lower surface of the sealing portion (630). The reinforcing portion (640) and the sealing portion (630) may be made of the same material. The reinforcing portion (640) may be formed integrally with the sealing portion (630). The reinforcing portion (640) may extend along the perimeter of the injection hole (154). The reinforcing portion (640) may have a square ring shape. The reinforcing portion (640) may extend along the perimeter of the inflow hole (211b). The thickness of the reinforcing portion (640) may be configured to be thicker than the thickness of the sealing portion (630). The thickness of the reinforcing part (640) can be configured to be thinner than the thickness of the first part (610).

[0153] The sealing portion (630) can seal the injection hole (154). The interior of the cooling channel (153) can be filled with cooling liquid (CL). The sealing portion (630) can seal the injection hole (154) so ​​that the cooling liquid (CL) does not leak through the injection hole (154).

[0154] The sealing portion (630) can receive pressure (P) from the cooling liquid (CL) flowing through the cooling channel (153). The reinforcing portion (640) can be placed at the part where the pressure (P) of the cooling liquid (CL) is concentrated. The reinforcing portion (640) can support the sealing portion (630). The reinforcing portion (640) can provide support force (S) to the sealing portion (630). By supporting the sealing portion (630), the reinforcing portion (640) can prevent the sealing portion (630) from sagging or deforming due to the pressure (P) of the cooling liquid (CL). Due to the reinforcing portion (640), the sealing portion (630) can stably seal the injection hole (154).

[0155] When a thermal event occurs, the sealing part (630) may easily melt or break. At this time, the reinforcing part (640) may also melt or break. As the sealing part (630) melts or breaks, the injection hole (154) and the inflow hole (211b) may be connected. Cooling liquid (CL) may flow into the interior of the battery module (200) through the injection hole (154) and the inflow hole (211b). As a result, the battery cell (220) where the thermal event occurred can be cooled quickly. Alternatively, the battery cell (220) where a fire occurred can be quickly extinguished.

[0156] FIG. 40 is a diagram showing a partial configuration of a battery pack (1000) according to another embodiment of the present invention. FIG. 41 is a bottom perspective view of the hole cover (600) and the first reinforcing member (710) of FIG. 40. FIG. 42 is a diagram showing another embodiment of a cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 43 is a diagram showing one embodiment of a cross-sectional configuration along the cutting line C-C' of FIG. 1. FIG. 44 is a diagram showing another embodiment of a cross-sectional configuration along the cutting line B-B' of FIG. 1.

[0157] Referring to FIGS. 40 through 44, a support (260) may be provided on the upper surface of a top plate (211a). The support (260) may extend along the left-right direction or the Y-axis direction. The support (260) may partition an inlet hole (211b). The support (260) may partition a plurality of inlet holes (211b). The support (260) may be coupled, fastened, contacted, or attached to the upper surface of the top plate (211a). The support (260) may also be formed integrally with the top plate (211a).

[0158] The hole cover (600) may include a receiving portion (603) in which a support (260) is received. The receiving portion (603) may be a groove (603). The receiving portion (603) may extend along the left-right direction or the Y-axis direction. The receiving portion (603) may be formed on the lower surface of the first part (610).

[0159] The first reinforcing member (710) may be coupled, attached, fastened, or fixed to the hole cover (600). The first reinforcing member (710) may be coupled, attached, fastened, or fixed to the lower surface of the sealing portion (630). The first reinforcing member (710) may be provided in multiple numbers. The first reinforcing member (710) may be provided to correspond one-to-one with the sealing portion (630). The first reinforcing member (710) may have a square plate shape. The first reinforcing member (710) and the sealing portion (630) may include the same material. The first reinforcing member (710) and the sealing portion (630) may be formed integrally.

[0160] The sealing portion (630) can seal the injection hole (154). The interior of the cooling channel (153) can be filled with cooling liquid (CL). The sealing portion (630) can seal the injection hole (154) so ​​that the cooling liquid (CL) does not leak through the injection hole (154).

[0161] The injection hole (154) may face the inflow hole (211b). The sealing portion (630) may be positioned between the injection hole (154) and the inflow hole (211b). The first reinforcing member (710) may be positioned on the lower surface of the sealing portion (630). The support (260) may be positioned below the first reinforcing member (710).

[0162] The hole cover (600) can be fixed between the top cover assembly (150) and the battery module (200). The hole cover (600) can be fixed between the lower plate (152) and the top plate (211a) of the top cover assembly (150).

[0163] The sealing portion (630) can receive pressure (P) from the cooling liquid (CL) flowing through the cooling channel (153). The first reinforcing member (710) can support the sealing portion (630). The first reinforcing member (710) can provide support force (S) to the sealing portion (630). By supporting the sealing portion (630), the first reinforcing member (710) can prevent the sealing portion (630) from sagging or deforming due to the pressure (P) of the cooling liquid (CL). Due to the first reinforcing member (710), the sealing portion (630) can stably seal the injection hole (154).

[0164] The support (260) can support the first reinforcing member (710). The support (260) can provide support to the first reinforcing member (710). By supporting the first reinforcing member (710), the support (260) can more strongly prevent the sealing portion (630) from sagging or deforming due to the pressure (P) of the cooling liquid (CL). Due to the support (260) and the first reinforcing member (710), the sealing portion (630) can more stably seal the injection hole (154).

[0165] When a thermal event occurs, the sealing portion (630) may easily melt or break. At this time, the first reinforcing member (710) may also melt or break. Alternatively, if the sealing portion (630) melts or breaks, the first reinforcing member (710) may fall downward. As the sealing portion (630) melts or breaks, the injection hole (154) and the inflow hole (211b) may be connected. Cooling liquid (CL) can flow into the interior of the battery module (200) through the injection hole (154) and the inflow hole (211b). As a result, the battery cell (220) where the thermal event occurred can be cooled quickly. Alternatively, the battery cell (220) where a fire occurred can be quickly extinguished.

[0166] FIG. 45 is a drawing showing a vehicle (V) according to one aspect of the present invention.

[0167] Referring to FIG. 45, 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.

[0168] 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 therein and an injection hole communicating with said fluid channel and facing said battery module; and, A battery pack comprising a hole cover that is fixed between the top cover assembly and the battery module and seals the injection hole.

2. In Paragraph 1, The above hole cover is, A battery pack coupled to the upper surface of the above battery module.

3. In Paragraph 1, The above hole cover is, A battery pack coupled to the lower surface of the above top cover assembly.

4. In Paragraph 1, The above hole cover is, A sealing portion facing the injection hole; and, It includes a first part that extends from the sealing portion and surrounds the sealing portion, The thickness of the above sealing portion is, A battery pack configured to be thinner than the thickness of the first part above.

5. In Paragraph 4, A battery pack further comprising a first reinforcing member disposed on the lower surface of the sealing portion.

6. In Paragraph 5, The above-mentioned first reinforcing member is, Battery pack having a plate shape.

7. In Paragraph 5, The above-mentioned first reinforcing member is, Battery pack having a mesh shape.

8. In Paragraph 5, The above hole cover is, A connecting hole formed in the sealing portion and facing the injection hole, and The above-mentioned first reinforcing member is, A battery pack sealing the above connection hole.

9. In Paragraph 5, A battery pack in which the sealing portion and the first reinforcing member are integrally formed.

10. In Paragraph 4, A battery pack further comprising a second reinforcing member disposed on the upper surface of the sealing portion.

11. In Paragraph 10, A battery pack in which the sealing portion and the second reinforcing member are integrally formed.

12. In Paragraph 4, The above hole cover is, It further includes a reinforcing member extending along the perimeter of the injection hole, and The thickness of the above reinforcing part is, A battery pack configured to be thinner than the thickness of the first part and thicker than the thickness of the sealing part.

13. In Paragraph 5, 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 facing the sealing portion.

14. In Paragraph 13, A battery pack configured such that the injection hole and the inlet hole are connected when a thermal event occurs.

15. In Paragraph 13, The above battery module is, A battery pack further comprising a support formed on the upper surface of the top plate, partitioning the inlet hole, and supporting the first reinforcing member.

16. In Paragraph 15, A battery pack in which the above support and the above top plate are integrally formed.

17. In Paragraph 15 The above hole cover is, It has a groove formed on the lower surface of the first part above, and The above support is, A battery pack accommodated in the above groove.

18. In Paragraph 1, The above hole cover is, The battery module is provided with an opening that exposes the upper surface of the battery module, and The above battery pack is, A battery pack further comprising a heat transfer member disposed in the above opening and in contact with the lower surface of the top cover assembly and the upper surface of the battery module.

19. In Paragraph 18, The above hole cover is, A battery pack further comprising a second part extending along the perimeter of the upper surface of the battery module.

20. An automobile comprising a battery pack according to any one of claims 1 to 19.

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