Battery pack and pack case

Abstract

A battery pack according to an embodiment of the present invention comprises: a bottom cover assembly having a communication hole formed in the upper surface thereof, and a discharge flow path and a first cooling flow path that are in communication with the communication hole; a battery cell positioned on the bottom cover assembly; a top cover assembly positioned on the battery cell and having an injection hole formed in the lower surface thereof and a second cooling flow path in communication with the injection hole; and a hole cover coupled to the lower surface of the top cover assembly and sealing the injection hole.

Description

Battery pack and pack case

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

[0002] This application is a priority application for Korean Patent Application No. 10-2025-0022942 filed on February 21, 2025 and Korean Patent Application No. 10-2026-0024623 filed on February 6, 2026, 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] The present invention provides a battery pack and a pack case with an improved structure to properly control the emission of flames, etc., generated inside a battery module, and an automobile including the same.

[0013] The present invention provides a structure capable of rapidly injecting cooling liquid into a battery module when a thermal event occurs.

[0014] The present invention provides a structure capable of suppressing heat propagation between battery cells or battery modules.

[0015] The present invention provides a structure in which a cooling liquid injected into the interior of a battery module can be discharged to the exterior of the battery module.

[0016] The present invention provides a structure capable of maintaining a cooling function even when a thermal event occurs.

[0017] 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.

[0018] A battery pack according to one embodiment of the present invention may include: a bottom cover assembly having a communication hole formed on an upper surface, a discharge channel communicating with the communication hole, and a first cooling channel; a battery cell positioned above the bottom cover assembly; a top cover assembly positioned above the battery cell, having an injection hole formed on a lower surface and a second cooling channel communicating with the injection hole; and a hole cover coupled to the lower surface of the top cover assembly and sealing the injection hole.

[0019] The battery pack may further include a first cooling liquid disposed in the first cooling channel.

[0020] The battery pack further includes a side wall installed on the bottom cover assembly; and a venting device provided on the side wall, and the discharge path may be in communication with the venting device.

[0021] The battery pack may further include a second cooling liquid disposed in the second cooling channel.

[0022] The above communication hole can face the battery cell.

[0023] The injection hole can be placed on top of the battery cell.

[0024] The above discharge channel and the above first cooling channel can be configured independently.

[0025] The battery pack further includes a module case located between the bottom cover assembly and the top cover assembly and providing space inside, and the battery cells can be accommodated inside the module case.

[0026] The above module case may have an inlet hole formed on the upper surface and facing the hole cover.

[0027] The above module case may have a venting hole formed on the lower surface and communicating with the communication hole.

[0028] The above venting hole may face the battery cell.

[0029] The battery cell comprises: a housing portion having an electrode assembly; a sealing portion extending from the housing portion; and an electrode lead protruding from the sealing portion, and the venting hole may be disposed below the sealing portion.

[0030] A pack case according to another embodiment of the present invention is a pack case capable of accommodating a battery pack inside, comprising a bottom cover assembly and a top cover assembly coupled to the bottom cover assembly above the bottom cover assembly, wherein the bottom cover assembly has a communication hole formed on its upper surface, a discharge channel communicating with the communication hole, and a first cooling channel designed to allow a first cooling liquid to flow, and the top cover assembly has an injection hole formed on its lower surface and designed to inject a second cooling liquid into a battery pack accommodated in the lower portion, and a second cooling channel communicating with the injection hole, and wherein the top cover assembly includes a hole cover coupled to the lower surface to seal the injection hole.

[0031] The above hole cover includes a material with a melting point below a specific temperature.

[0032] The above hole cover contains PLA (Poly Lactic Acid).

[0033] The exhaust passage provided in the bottom cover assembly is connected to the outside through a venting device to discharge the venting gas (G) flowing into the exhaust passage to the outside.

[0034] An automobile according to one aspect of the present invention includes a battery pack of the present invention.

[0035] 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.

[0036] According to at least one of the embodiments of the present invention, the thermal stability of the battery pack can be improved.

[0037] According to at least one of the embodiments of the present invention, the electrical safety of the battery pack can be improved.

[0038] 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.

[0039] According to at least one of the embodiments of the present invention, the cooling function can be maintained even if a thermal event occurs.

[0040] The following drawings attached to this specification illustrate 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.

[0041] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention.

[0042] Figure 2 is a diagram showing a partial configuration of the battery pack of Figure 1 separated.

[0043] Figure 3 is a diagram showing a partial configuration of the battery pack of Figure 2 separated.

[0044] Figure 4 is a drawing showing the top cover assembly of Figure 3.

[0045] Figure 5 is a diagram showing a partial configuration of the top cover assembly of Figure 4 separated.

[0046] Figure 6 is an enlarged view of section D of Figure 5.

[0047] Fig. 7 is a bottom perspective view of Fig. 5.

[0048] FIG. 8 is a bottom perspective view of the top cover assembly of FIG. 4.

[0049] Figure 9 is a drawing showing the cross-sectional configuration along the cutting line B-B' of Figure 4.

[0050] Figure 10 is a drawing showing the cross-sectional configuration along the cutting line C-C' of Figure 4.

[0051] Figure 11 is a drawing showing the support of Figure 3.

[0052] Figure 12 is a drawing showing the battery module of Figure 3.

[0053] FIG. 13 is a diagram showing a partial configuration of the battery module of FIG. 12 separated.

[0054] Figure 14 is a diagram showing a part of the configuration of the battery pack of Figure 3.

[0055] Figure 15 is a diagram showing a partial configuration of the battery pack of Figure 3 separated.

[0056] FIG. 16 is a bottom view of the first upper plate.

[0057] Figure 17 is a drawing showing the cross-sectional configuration along the cutting line E-E' of Figure 14.

[0058] FIG. 18 is a drawing showing the cross-sectional configuration along the cutting line A-A' of FIG. 1.

[0059] Figure 19 is an enlarged view of section F of Figure 18.

[0060] FIG. 20 is an enlarged view of section F of FIG. 18 at the time of a thermal event.

[0061] Figure 21 is an enlarged view of section G of Figure 18.

[0062] FIG. 22 is an enlarged view of section G of FIG. 18 when a thermal event occurs.

[0063] FIG. 23 is an enlarged view of section H of FIG. 18.

[0064] Figure 24 is an enlarged view of section H of Figure 18 when a thermal event occurs.

[0065] FIG. 25 is an enlarged view of part I of FIG. 18.

[0066] FIG. 26 is an enlarged view of section I of FIG. 18 at the time of a thermal event.

[0067] Figure 27 is a diagram showing the flow of the discharge channel and the first cooling channel.

[0068] FIG. 28 is a drawing showing a vehicle according to one aspect of the present invention.

[0069] In parts of the attached drawings, corresponding components are given the same reference numerals. Those skilled in the art understand that the drawings are intended to illustrate elements simply and clearly and are not necessarily drawn to scale. For example, to aid in understanding various embodiments, the dimensions of some elements depicted in the drawings may be exaggerated compared to others. Additionally, elements of known technology that are useful or essential in commercially viable embodiments may often be omitted so as not to hinder the spirit of the various embodiments of the present invention.

[0070] 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.

[0071] 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.

[0072] One embodiment of the present invention provides a battery pack and a pack case in which, upon the occurrence of a thermal event, a cooling liquid can be rapidly injected into the interior of a battery module, and at the same time, the thermal stability and electrical stability of the battery pack are improved.

[0073] 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.

[0074] Referring to FIGS. 1 to 3, the pack case (100) may provide an internal space. The pack 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).

[0075] The pack 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).

[0076] The pack 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).

[0077] 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.

[0078] 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.

[0079] The battery module (200) may be placed inside the pack 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).

[0080] A venting device (500) may be installed on a side wall (120). For example, the venting device (500) may be installed on the left side wall (120). For example, the venting device (500) may be a gas valve. The venting device (500) may open to release gas when the pressure inside the pack case (100) increases. Additionally, the venting device (500) may block external air from entering the inside of the pack case (100). Multiple venting devices (500) may be provided.

[0081] A third heat transfer member (800) may be positioned between the top cover assembly (150) and the battery module (200). A third heat transfer member (800) may be provided for each battery module (200). For example, the third heat transfer member (800) may be made of a material with high thermal conductivity. For example, the third heat transfer member (800) may be resin.

[0082] 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 D 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. FIG. 9 is a drawing showing the cross-sectional configuration along the cutting line B-B' of FIG. 4. FIG. 10 is a drawing showing the cross-sectional configuration along the cutting line C-C' of FIG. 4.

[0083] Referring to FIGS. 4 through 10, a top cover assembly (150) according to one embodiment of the present invention may include a second upper plate (151) and a second lower plate (152). The second upper plate (151) may have a square shape. The second upper plate (151) may form the exterior of a battery pack (1000). The second lower plate (152) may have a square shape. The second lower plate (152) may form the exterior of a battery pack (1000). The second upper plate (151) may be placed on top of the second lower plate (152). The top cover assembly (150) may include a second cooling channel (153) inside. The second cooling channel (153) may be placed between the second upper plate (151) and the second lower plate (152). The top cover assembly (150) may include an injection hole (154). The injection hole (154) may be formed in the second lower plate (152). The injection hole (154) may be in communication with the second cooling channel (153). The injection hole (154) may have a square shape. The injection hole (154) may extend along the front-rear direction or the X-axis direction. The injection hole (154) may be provided in multiple numbers. The multiple injection holes (154) may be arranged along the left-right direction or the Y-axis direction.

[0084] A second cooling liquid (CL2, e.g., see FIG. 18) may flow through the second cooling channel (153). The second cooling liquid (CL2) may flow through the second cooling channel (153) and cool heat generated from the battery module (200). For example, the second cooling liquid (CL2) may be water.

[0085] 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 second lower plate (152). For example, the hole cover (155) may be fused to the lower surface of the second 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). For example, in the case of FIGS. 5 and 7, four hole covers (155) are provided corresponding to four battery modules (200).

[0086] 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.

[0087] FIG. 11 is a drawing showing the support (600) of FIG. 3.

[0088] Referring to FIG. 11, 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.

[0089] 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 (211). 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.

[0090] 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.

[0091] FIG. 12 is a drawing showing the battery module (200) of FIG. 3. FIG. 13 is a drawing showing a partial configuration of the battery module (200) of FIG. 12 separated.

[0092] Referring to FIGS. 12 and 13, 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 a top plate (211) and a lower frame (212).

[0093] The top plate (211) may be provided with an inlet hole (211a). The inlet hole (211a) may extend along the front-rear direction or the X-axis direction. The inlet hole (211a) may be provided in multiple numbers. The multiple inlet holes (211a) may be arranged along the left-right direction or the Y-axis direction.

[0094] 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. For example, 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.

[0095] 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) of the battery cell (220) 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.

[0096] 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.

[0097] Such barriers (250) may be provided with an elastic material to enable the 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.

[0098] 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).

[0099] 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).

[0100] The lower frame (212) may include a bottom plate (212a). A battery cell (220) may be placed between the bottom plate (212a) of the lower frame (212) and the top plate (211). For example, the battery cell (220) may be placed on the bottom plate (212a) of the lower frame (212) and below the top plate (211).

[0101] The bottom plate (212a) may be provided with a first venting hole (212b1). The first venting hole (212b1) may be provided on the front side of the bottom plate (212a). The first venting hole (212b1) may be provided in multiple numbers. The multiple first venting holes (212b1) may be arranged along the left-right direction or the Y-axis direction. The first venting hole (212b1) may face the first sealing portion (222). The first venting hole (212b1) may face the electrode lead (224).

[0102] The bottom plate (212a) may be provided with a second venting hole (212b2). The second venting hole (212b2) may be provided in the central part of the bottom plate (212a). The second venting hole (212b2) may be positioned between the first venting hole (212b1) and the third venting hole (212b3) to be described later. The second venting hole (212b2) may be provided in multiple numbers. The multiple second venting holes (212b2) may be arranged along the left-right direction or the Y-axis direction. The second venting hole (212b2) may face the storage portion (221).

[0103] The bottom plate (212a) may be provided with a third venting hole (212b3). The third venting hole (212b3) may be provided on the rear side of the bottom plate (212a). Multiple third venting holes (212b3) may be provided. Multiple third venting holes (212b3) may be arranged along the left-right direction or the Y-axis direction. The third venting hole (212b3) may face the first sealing portion (222). The third venting hole (212b3) may face the electrode lead (224).

[0104] When a thermal event occurs in the battery cell (220), the venting gas (G) can be discharged through the first venting hole (212b1), the second venting hole (212b2), and the third venting hole (212b3) of the lower frame (212).

[0105] The lower frame (212) may include a side plate (212c). The side plate (212c) may be provided as a pair. The side plate (212c) may be provided on the left and right sides of the bottom plate (212a), respectively. The side plate (212c) may extend upward from the bottom plate (212a).

[0106] The top plate (211) and the lower frame (212) can be combined, fastened, attached, or assembled. The top plate (211) can be combined, fastened, attached, or assembled with a pair of side plates (212c) of the lower frame (212).

[0107] The first heat transfer member (261) may be positioned between the bottom plate (212a) of the lower frame (212) and the battery cell (220). The first heat transfer member (261) may be positioned between the storage portion (221) of the battery cell (220) and the bottom plate (212a) of the lower frame (212). The first heat transfer member (261) may be positioned between the second sealing portion (223) of the battery cell (220) and the bottom plate (212a) of the lower frame (212). The first heat transfer member (261) may be positioned between the first venting hole (212b1) and the second venting hole (212b2) of the bottom plate (212a). For example, the first heat transfer member (261) may be a resin with high thermal conductivity. The first heat transfer member (261) can combine or attach the bottom plate (212a) and the battery cell (220).

[0108] The second heat transfer member (262) may be positioned between the bottom plate (212a) of the lower frame (212) and the battery cell (220). The second heat transfer member (262) may be positioned between the storage portion (221) of the battery cell (220) and the bottom plate (212a) of the lower frame (212). The second heat transfer member (262) may be positioned between the second sealing portion (223) of the battery cell (220) and the bottom plate (212a) of the lower frame (212). The second heat transfer member (262) may be positioned between the third venting hole (212b3) and the second venting hole (212b2) of the bottom plate (212a). For example, the second heat transfer member (262) may be a resin with high thermal conductivity. The second heat transfer member (262) can combine or attach the bottom plate (212a) of the lower frame (212) and the battery cell (220).

[0109] A pair of end covers (270) can be coupled, fastened, attached, or assembled to the front and rear sides of the module case (210), respectively. A pair of end covers (270) can cover the front and rear sides of the module case (210). The end covers (270) can be coupled, fastened, attached, or assembled to the top plate (211). The end covers (270) can be coupled, fastened, attached, or assembled to a pair of side plates (212c) of the lower frame (212). The end covers (270) can have a square shape. The end covers (270) can form the exterior of the battery module (200).

[0110] An insulating cover (240) may be positioned between the end cover (270) and the busbar frame assembly (230). An insulating cover (240) may be provided as a pair. A front insulating cover (240) may be positioned between the front end cover (270) and the front busbar frame assembly (230). A rear insulating cover (240) may be positioned between the rear end cover (270) and the rear busbar frame assembly (230). The insulating cover (240) may electrically insulate the busbar frame assembly (230) and the end cover (270).

[0111] FIG. 14 is a drawing showing a partial configuration of the battery pack (1000) of FIG. 3. FIG. 15 is a drawing showing a partial configuration of the battery pack (1000) of FIG. 3 separated. FIG. 16 is a bottom view of the first upper plate (111). FIG. 17 is a drawing showing a cross-sectional configuration along the cutting line E-E' of FIG. 14.

[0112] Referring to FIGS. 14 through 17, the bottom cover assembly (110) may include a first upper plate (111) and a first lower plate (118). The first upper plate (111) may have a square shape. The first upper plate (111) may form the exterior of the battery pack (1000). The first lower plate (118) may have a square shape. The first lower plate (118) may form the exterior of the battery pack (1000). The first upper plate (111) may be placed on top of the first lower plate (118).

[0113] The bottom cover assembly (110) may include a first cooling channel (113) inside. The first cooling channel (113) may be positioned between the first upper plate (111) and the first lower plate (118). The first upper plate (111) may include an inlet (116) and an outlet (117). The inlet (116) and the outlet (117) may each be in communication with the first cooling channel (113).

[0114] The bottom cover assembly (110) may include a discharge channel (112) inside. The discharge channel (112) may be positioned between the first upper plate (111) and the first lower plate (118). The first upper plate (111) may have a first communication hole (114a). The first communication hole (114a) may be in communication with the discharge channel (112). The first communication hole (114a) may be provided in multiple numbers. The multiple first communication holes (114a) may be arranged along the left-right direction or the Y-axis direction. The first communication hole (114a) of the bottom cover assembly (110) may be provided to correspond one-to-one with the first venting hole (212b1) of the lower frame (212). A plurality of first communication holes (114a) of the bottom cover assembly (110) can be in communication with a plurality of first venting holes (212b1) of the lower frame (212).

[0115] The first upper plate (111) of the bottom cover assembly (110) may be provided with a second communication hole (114b). The second communication hole (114b) may be in communication with a discharge channel (112) formed in the bottom cover assembly (110). The second communication hole (114b) may be provided in multiple numbers. The multiple second communication holes (114b) may be arranged along the left-right direction or the Y-axis direction. The second communication hole (114b) may be provided to correspond one-to-one with the second venting hole (212b2) of the lower frame (212). The multiple second communication holes (114b) of the bottom cover assembly (110) may be in communication with the multiple second venting holes (212b2) of the lower frame (212).

[0116] The first upper plate (111) of the bottom cover assembly (110) may be provided with a third communication hole (114c). The third communication hole (114c) may be in communication with a discharge channel (112) formed in the bottom cover assembly (110). The third communication hole (114c) may be provided in multiple numbers. The multiple third communication holes (114c) may be arranged along the left-right direction or the Y-axis direction. The third communication hole (114c) may be provided to correspond one-to-one with the third venting hole (212b3) of the lower frame (212). The multiple third communication holes (114c) of the bottom cover assembly (110) may be in communication with the multiple third venting holes (212b3) of the lower frame (212). The third communication hole (114c) of the bottom cover assembly (110) can be positioned between the first communication hole (114a) and the second communication hole (114b).

[0117] The first cooling channel (113) and the discharge channel (112) may be configured independently. For example, the first cooling channel (113) and the discharge channel (112) may not be connected.

[0118] The first cooling liquid (CL1) can flow through the first cooling channel (113). The first cooling liquid (CL1) flows through the first cooling channel (113) and can cool the heat generated from the battery module (200). For example, the first cooling liquid (CL1) may be water.

[0119] Venting gas (G) discharged through the first venting hole (212b1), the second venting hole (212b2), and the third venting hole (212b3) formed in the bottom plate (212a), which is part of the lower frame (212), can flow through the discharge channel (112) formed in the bottom cover assembly (110).

[0120] The flow of the first cooling liquid (CL1) and the venting gas (G) can be formed independently. The flow of the first cooling liquid (CL1) and the venting gas (G) can be separated.

[0121] The first upper plate (111) of the bottom cover assembly (110) may be provided with a fourth communication hole (115). The fourth communication hole (115) may be in communication with a discharge passage (112) formed in the bottom cover assembly (110). The fourth communication hole (115) may be in communication with a side wall (120). The fourth communication hole (115) may be in communication with a venting device (500) installed in the side wall (120). Venting gas (G) introduced into the discharge passage (112) formed in the bottom cover assembly (110) may be discharged to the outside of the battery pack (1000) through the fourth communication hole (115), the side wall (120), and the venting device (500).

[0122] FIG. 18 is a drawing showing the cross-sectional configuration along the cutting line A-A' of FIG. 1.

[0123] Referring to FIGS. 3 and FIGS. 18, the battery module (200) may be installed, coupled, fastened, fixed, or attached to the upper surface of the bottom cover assembly (110). The battery module (200), formed by a plurality of battery cells (220), may be installed, coupled, fastened, fixed, or attached to the upper surface of the first upper plate (111). The battery module (200) may be cooled by a first cooling liquid (CL1) flowing through a first cooling channel (113).

[0124] The battery module (200) may be cooled by a second cooling liquid (CL2) flowing through a second cooling channel (153). A third heat transfer member (800) may be positioned between the battery module (200) and the top cover assembly (150). The third heat transfer member (800) may be in contact with, coupled with, or attached to the battery module (200). The third heat transfer member (800) may be in contact with, coupled with, or attached to the top cover assembly (150). The third heat transfer member (800) may be positioned between the top plate (211) and the second lower plate (152). The third heat transfer member (800) may be in contact with, coupled with, or attached to the top plate (211). The third heat transfer member (800) may be in contact with, coupled with, or attached to the second lower plate (152). A third heat transfer member (800) may be placed in the opening (601). For example, the third heat transfer member (800) may be resin. The first part (610) and the second part (620) may limit the filling area of ​​the third heat transfer member (800). The third 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 third heat transfer member (800).

[0125] When a thermal event occurs, the structure of the battery pack (1000) may be damaged. At this time, according to an embodiment of the present invention, cooling of the battery module (200) can continue even if either the bottom cover assembly (110) or the top cover assembly (150) is damaged. As a result, the thermal safety of the battery pack (1000) can be improved.

[0126] FIG. 19 is an enlarged view of section F of FIG. 18. FIG. 20 is an enlarged view of section F of FIG. 18 when a thermal event occurs.

[0127] Referring to FIGS. 18 to 20, the support (600) can be attached to the upper surface of the battery module (200), for example, the upper surface of the top plate (211). The support (600) can be attached to the lower surface of the top cover assembly (150), for example, the lower surface of the second lower plate (152).

[0128] If the support (600) is made of a metal material, the support (600) may be joined by brazing welding to the upper surface of the battery module (200), for example, the upper surface of the top plate (211). If the support (600) is made of a metal material, the support (600) may be joined by brazing welding to the lower surface of the top cover assembly (150), for example, the lower surface of the second lower plate (152).

[0129] According to one embodiment, if the support (600) includes a metal material, the support (600) may be formed integrally with the battery module (200).

[0130] The hole cover (155) can seal the injection hole (154). The interior of the second cooling channel (153) can be filled with a second cooling liquid (CL2). The second cooling liquid (CL2) can flow along the second cooling channel (153). The hole cover (155) can seal the injection hole (154) so ​​that the second cooling liquid (CL2) does not leak through the injection hole (154).

[0131] According to one embodiment, the injection hole (154) may be positioned on top of the battery cell (220). The injection hole (154) may face the connection hole (611). A hole cover (155) may be positioned between the injection hole (154) and the connection hole (611). A support (600) may be positioned on the lower surface of the hole cover (155).

[0132] The support (600) can be fixed between the top cover assembly (150) and the battery module (200). For example, the support (600) can be fixed between the second lower plate (152) and the top plate (211) of the top cover assembly (150). The first part (610) can be fixed between the hole cover (155) and the top plate (211) of the top cover assembly (150). The first part (610) can be compressed between the hole cover (155) and the top plate (211). The support (600) can support the hole cover (155). The first part (610) can support the hole cover (155).

[0133] The hole cover (155) can receive pressure (P) from the second cooling liquid (CL2) flowing through the second 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 second cooling liquid (CL2). Due to the first part (610), the hole cover (155) can stably seal the injection hole (154).

[0134] 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).

[0135] The connecting hole (611) may face the inlet hole (211a). The connecting hole (611) may be in communication with the inlet hole (211a). The connecting hole (611) may have substantially the same size as the inlet hole (211a). The diameter of the connecting hole (611) may be substantially the same as the diameter of the inlet hole (211a). The inlet hole (211a) may face the hole cover (155).

[0136] According to one embodiment, the connection hole (611) may have substantially the same size as the injection hole (154). The diameter of the connection hole (610) 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. As the sealing portions (222, 223) melt or are damaged, the injection hole (154), the connection hole (611), and the inlet hole (211a) can be connected. The second cooling liquid (CL2) can be introduced into the interior of the battery module (200) through the injection hole (154), the connection hole (611), and the inlet hole (211a). As a result, a battery cell (220) that has caught fire, for example, can be rapidly cooled and suppressed.

[0137] FIG. 21 is an enlarged view of section G of FIG. 18. FIG. 22 is an enlarged view of section G of FIG. 18 when a thermal event occurs.

[0138] Referring to FIGS. 18, 21, and 22, the first communication hole (114a) of the bottom cover assembly (110) may face the first venting hole (212b1) of the lower frame (212). Due to this structure, the first communication hole (114a) of the bottom cover assembly (110) may face the battery cell (220). The first communication hole (114a) of the bottom cover assembly (110) may face the first sealing portion (222) of the battery cell (220). Additionally, the first communication hole (114a) of the bottom cover assembly (110) may face the electrode lead (224) of the battery cell (220).

[0139] When a thermal event occurs, the venting gas (G) generated from the battery cell (220) can flow into the exhaust passage (112) formed in the bottom cover assembly (110) through the first venting hole (212b1) of the lower frame (212) and the first communication hole (114a) of the bottom cover assembly (110). The venting gas (G) flowing into the exhaust passage (112) can be discharged to the outside of the battery pack (1000) through the fourth communication hole (115), the side wall (120), and the venting device (500).

[0140] When a thermal event occurs, the second cooling liquid (CL2) introduced into the interior of the battery module (200) can flow into the discharge channel (112) formed in the bottom cover assembly (110) through the first venting hole (212b1) of the lower frame (212) and the first communication hole (114a) of the bottom cover assembly (110). If the second cooling liquid (CL2) remains inside the battery module (200), it may cause trouble such as an electrical short circuit. However, due to the first venting hole (212b1) of the lower frame (212) and the first communication hole (114a) of the bottom cover assembly (110), the second cooling liquid (CL2) can rapidly cool the battery cell (220) of the battery module (200) and flow into the discharge channel (112) formed in the bottom cover assembly (110), thereby preventing electrical trouble. As a result, the thermal stability and electrical stability of the battery pack (1000) can be improved.

[0141] FIG. 23 is an enlarged view of section H of FIG. 18. FIG. 24 is an enlarged view of section H of FIG. 18 when a thermal event occurs.

[0142] Referring to FIGS. 18, 23 and 24, the second communication hole (114b) of the bottom cover assembly (110) may face the second venting hole (212b2) of the lower frame (212). Due to this structure, the second communication hole (114b) of the bottom cover assembly (110) may face the battery cell (220). The second communication hole (114b) of the bottom cover assembly (110) may face the storage portion (221) and the second sealing portion (223) of the battery cell (220).

[0143] When a thermal event occurs, the venting gas (G) can flow into the exhaust passage (112) formed in the bottom cover assembly (110) through the second venting hole (212b2) of the lower frame (212) and the second communication hole (114b) of the bottom cover assembly (110). The venting gas (G) flowing into the exhaust passage (112) can be discharged to the outside of the battery pack (1000) through the fourth communication hole (115), the side wall (120), and the venting device (500).

[0144] When a thermal event occurs, the second cooling liquid (CL2) introduced into the interior of the battery module (200) can flow into the discharge channel (112) formed in the bottom cover assembly (110) through the second venting hole (212b2) of the lower frame (212) and the second communication hole (114b) of the bottom cover assembly (110). If the second cooling liquid (CL2) remains inside the battery module (200), it may cause trouble such as an electrical short circuit. However, due to the second venting hole (212b2) of the lower frame (212) and the second communication hole (114b) of the bottom cover assembly (110), the second cooling liquid (CL2) can rapidly cool the battery cell (220) and flow into the discharge channel (112) formed in the bottom cover assembly (110), thereby preventing electrical trouble. As a result, the thermal stability and electrical stability of the battery pack (1000) can be improved.

[0145] FIG. 25 is an enlarged view of section I of FIG. 18. FIG. 26 is an enlarged view of section I of FIG. 18 when a thermal event occurs.

[0146] Referring to FIGS. 18, 25, and 26, the third communication hole (114c) of the bottom cover assembly (110) may face the third venting hole (212b3) of the lower frame (212). Due to this structure, the third communication hole (114c) of the bottom cover assembly (110) may face the battery cell (220). For example, the third communication hole (114c) of the bottom cover assembly (110) may face the first sealing portion (222) and the electrode lead (224) of the battery cell (220).

[0147] When a thermal event occurs, the venting gas (G) can flow into the exhaust passage (112) formed in the bottom cover assembly (110) through the third venting hole (212b3) of the lower frame (212) and the third communication hole (114c) of the bottom cover assembly (110). The venting gas (G) flowing into the exhaust passage (112) can be discharged to the outside of the battery pack (1000) through the fourth communication hole (115), the side wall (120), and the venting device (500).

[0148] When a thermal event occurs, the second cooling liquid (CL2) introduced into the interior of the battery module (200) can be introduced into the discharge path (112) formed in the bottom cover assembly (110) through the third venting hole (212b3) of the lower frame (212) and the third communication hole (114c) of the bottom cover assembly (110). If the second cooling liquid (CL2) remains inside the battery module (200), it may cause trouble such as an electrical short circuit. However, due to the third venting hole (212b3) of the lower frame (212) and the third communication hole (114c) of the bottom cover assembly (110), the second cooling liquid (CL2) can rapidly cool the battery cell (220) and be introduced into the discharge path (112) formed in the bottom cover assembly (110), thereby preventing electrical trouble. As a result, the thermal stability and electrical stability of the battery pack (1000) can be improved.

[0149] FIG. 27 is a diagram showing the flow of the discharge channel (112) and the first cooling channel (113).

[0150] Referring to FIG. 27, when a thermal event occurs, the venting gas (G) and the second cooling liquid (CL2) discharged through the first venting hole (212b1), the second venting hole (212b2), and the third venting hole (212b3) of the lower frame (212) can flow through the discharge channel (112) formed in the bottom cover assembly (110).

[0151] The flow of the first cooling liquid (CL1) and the venting gas (G) can be formed independently of each other so that the flow can be separated. Additionally, the flow of the first cooling liquid (CL1) and the second cooling liquid (CL2) can be formed independently of each other so that the flow can be separated.

[0152] When a thermal event occurs, the second cooling liquid (CL2) is injected into the battery module (200) and flows into the discharge channel (112) formed in the bottom cover assembly (110), thereby reducing the cooling function of the top cover assembly (150). At this time, even if the cooling function of the top cover assembly (150) is reduced, the first cooling liquid (CL1) flows through the first cooling channel (113) and can cool the heat generated from the battery module (200). As a result, the thermal stability and electrical stability of the battery pack (1000) can be improved.

[0153] FIG. 28 is a drawing showing a vehicle (V) according to one aspect of the present invention.

[0154] Referring to FIG. 28, a battery pack (1000) according to the present invention may be applied to a vehicle (V), such as an electric vehicle or a hybrid vehicle. A vehicle (V) according to the present invention may include a battery pack (1000) according to one embodiment of the present invention. In addition, a 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, a vehicle (V) according to the present invention may further include a vehicle body, a motor, an electronic control unit (ECU), and other control devices.

[0155] Meanwhile, although terms indicating directions such as up, down, left, right, front, and back have been used in this specification, these terms are used merely for convenience of explanation, and it is obvious to those skilled in the art that they may vary depending on the location of the object or the position of the observer.

[0156] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

Claims

1. A bottom cover assembly having a communication hole formed on an upper surface, a discharge channel communicating with the communication hole, and a first cooling channel; A battery cell located on top of the above bottom cover assembly; A top cover assembly positioned above the battery cell, comprising an injection hole formed on the lower surface and a second cooling channel communicating with the injection hole; and, A battery pack comprising a hole cover coupled to the lower surface of the top cover assembly and sealing the injection hole.

2. In Paragraph 1, A battery pack further comprising a first cooling liquid disposed in the first cooling channel.

3. In Paragraph 1, A side wall installed on the above-mentioned bottom cover assembly; and, It further includes a venting device provided on the side wall, and The above discharge path is, A battery pack connected to the above-mentioned venting device.

4. In Paragraph 1, A battery pack further comprising a second cooling liquid disposed in the second cooling channel.

5. In Paragraph 1, The above communication hole is, A battery pack facing the above battery cell.

6. In Paragraph 1, The injection hole above is, A battery pack placed on top of the above battery cell.

7. In Paragraph 1, A battery pack in which the above discharge path and the above first cooling path are configured independently.

8. In Paragraph 1, It further includes a module case located between the bottom cover assembly and the top cover assembly and providing space inside, The above battery cell is, A battery pack housed inside the above module case.

9. In Paragraph 8, The above module case is, A battery pack having an inlet hole formed on the upper surface and facing the hole cover.

10. In Paragraph 8, The above module case is, A battery pack having a venting hole formed on the lower surface and communicating with the above communication hole.

11. In Paragraph 10, The above venting hole is, A battery pack facing the above battery cell.

12. In Paragraph 11, The above battery cell is: A storage unit equipped with an electrode assembly; A sealing portion extending from the above storage portion; and, It includes an electrode lead protruding from the sealing portion, and The above venting hole is, A battery pack positioned below the above-mentioned sealing portion.

13. As a pack case capable of accommodating a battery pack internally, It includes a bottom cover assembly and a top cover assembly coupled to the bottom cover assembly on top of the bottom cover assembly, The above bottom cover assembly has a communication hole formed on the upper surface, a discharge channel communicating with the communication hole, and a first cooling channel designed to allow a first cooling liquid to flow. The above top cover assembly has an injection hole formed on the lower surface and designed to inject a second cooling liquid into a battery pack received at the bottom, and a second cooling channel communicating with said injection hole, and, The above top cover assembly is a pack case including a hole cover that is coupled to the lower surface and seals the injection hole.

14. In Paragraph 13, The above hole cover is a pack case containing a material with a melting point below a specific temperature.

15. In Paragraph 14, The above hole cover is a pack case containing PLA (Poly Lactic Acid).

16. In Paragraph 13, A pack case designed such that the discharge channel provided in the bottom cover assembly is connected to the outside through a venting device to discharge the venting gas (G) flowing into the discharge channel to the outside.

17. An automobile comprising the battery pack of claim 1.

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