Battery pack

Abstract

A battery pack is disclosed. The battery pack according to an embodiment of the present invention may comprise: a base plate; an upper plate that comprises a coupling portion coupled to the upper surface of the base plate, a protruding portion extending rearward from the coupling portion and providing an internal space, and a buffer portion extending forward from the coupling portion and providing an internal space; and a battery module that has a venting portion facing the buffer portion and is in contact with the protruding portion.

Description

battery pack

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

[0002] This application is a priority application for Korean Patent Application No. 10-2024-0156375 filed on November 6, 2024 and Korean Patent Application No. 10-2025-0131047 filed on September 12, 2025, the entire contents 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 for these products, such as rechargeable 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 a battery case, which is an outer casing 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] Meanwhile, as secondary batteries are used in pack units in medium to large-scale devices such as electric vehicles and energy storage systems, research on safety issues regarding secondary batteries, including events such as thermal runaway, is actively underway.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] The present invention provides a battery pack with an improved structure capable of appropriately controlling the emission of flames, etc., generated inside the battery pack, and a vehicle including the same.

[0014] The present invention provides a structure capable of smoothly discharging venting gas generated inside a battery pack.

[0015] The present invention also provides a structure that can minimize damage to the battery pack when a thermal event occurs.

[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 may include: a base plate; an upper plate comprising a coupling portion coupled to the upper surface of the base plate, a protrusion extending rearward from the coupling portion and providing an internal space, and a buffer portion extending forward from the coupling portion and providing an internal space; and a battery module having a venting portion facing the buffer portion and in contact with the protrusion portion.

[0018] The above buffer may be spaced apart from the base plate.

[0019] The above buffer part may be spaced apart from the above venting part.

[0020] The above buffer portion may extend toward the above venting portion.

[0021] The height of the above buffer portion may be configured to be lower than the height of the above protrusion.

[0022] The above protrusion may include: a support portion in contact with the battery module; and an inclined portion connecting the support portion and the coupling portion and having an inlet hole.

[0023] The above-mentioned inclined portion may include a convex portion protruding outward.

[0024] The above-mentioned inclined portion may include a concave portion protruding inward.

[0025] The above-mentioned inclined portion may include a venting guide that covers a portion of the inlet hole.

[0026] The above venting guide may include a first venting guide extending to the outside of the inclined portion.

[0027] The above venting guide may include a second venting guide extending inwardly to the inclined portion.

[0028] The battery pack may further include a venting device located inside the upper plate and installed on the base plate.

[0029] An automobile according to another aspect of the present invention for achieving the above-mentioned purpose includes a battery pack according to the present invention.

[0030] A battery pack case according to another embodiment of the present invention comprises a base assembly; a side wall installed on an upper corner of the base assembly; and a pack cover installed on the side wall, wherein the base assembly comprises a base plate; and an upper plate comprising a coupling portion coupled to the upper surface of the base plate, a protrusion extending rearward from the coupling portion and providing a space inside, and a cushioning portion extending forward from the coupling portion and providing a space inside, wherein the protrusion may be designed so that a battery module is contacted from above, and the cushioning portion may be designed so that a venting portion of the battery module contacted from above faces the protrusion.

[0031] The above-mentioned protrusion includes a support member installed spaced apart from the base plate, and the battery module can be installed by being fastened to the support member from the top.

[0032] The above-mentioned protrusion includes an inclined portion, the inclined portion connects the support portion and the coupling portion, and a plurality of inlet holes may be formed in the inclined portion.

[0033] The height of the above buffer portion may be configured to be lower than the height of the above protrusion.

[0034] The above upper plate can be formed as a single piece.

[0035] According to at least one of the embodiments of the present invention, venting gas generated inside a battery pack can be easily discharged.

[0036] According to at least one of the embodiments of the present invention, external damage to the battery pack can be prevented even if a thermal event occurs.

[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 can be suppressed.

[0039] 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.

[0040] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention.

[0041] Figure 2 is a diagram showing a partial configuration of the battery pack of Figure 1 separated.

[0042] Figure 3 is a drawing showing the battery module of Figure 2.

[0043] Figure 4 is a drawing showing the battery module of Figure 3 in a different direction.

[0044] Figure 5 is a diagram showing a partial configuration of the battery module of Figure 3 separated.

[0045] Figure 6 is a diagram showing the laminate of Figure 5 separated.

[0046] Figure 7 is a diagram showing the change in Figure 4 when a thermal event occurs.

[0047] Figure 8 is a drawing showing the base assembly of Figure 2.

[0048] Figure 9 is a disassembled drawing of the base assembly of Figure 8.

[0049] Figure 10 is a drawing showing a cross-sectional configuration along the cutting line B-B' of Figure 8.

[0050] Figure 11 is a drawing showing the cross-sectional configuration along the cutting line C-C' of Figure 8.

[0051] FIG. 12 is a drawing showing a cross-sectional configuration along the cutting line A-A' of FIG. 1.

[0052] Figure 13 is a diagram showing the change in Figure 12 when a thermal event occurs.

[0053] Figure 14 is a drawing showing a modified embodiment of Figure 12.

[0054] FIG. 15 is a drawing showing another modified embodiment of FIG. 12.

[0055] FIG. 16 is a drawing showing another modified embodiment of FIG. 12.

[0056] FIG. 17 is a drawing showing a vehicle according to one aspect of the present invention.

[0057] 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.

[0058] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0059] Therefore, 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.

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

[0061] Referring to FIGS. 1 and 2, a battery pack (1000) according to one embodiment of the present invention may include a case (100). The case (100) may form the exterior of the battery pack (1000). The case (100) may have a rectangular shape. The case (100) may provide space inside. The case (100) may include a pack cover (150). The pack cover (150) may have a rectangular plate shape. A battery module (200) may be located inside the case (100). A plurality of battery modules (200) may be provided.

[0062] The case (100) may include a base assembly (110). The base assembly (110) may have a rectangular shape. The base assembly (110) may form the exterior of the battery pack (1000). The base assembly (110) may provide an internal space for the battery pack (1000).

[0063] The case (100) may include side walls (120). The side walls (120) may be installed, fastened, joined, fixed, or attached to the upper surface of the base assembly (110). The side walls (120) may consist of four. The side walls (120) may be arranged along the perimeter of the base assembly (110). The side walls (120) may form the exterior of the battery pack (1000). The side walls (120) may provide an internal space.

[0064] The side wall (120) may be equipped with a connector (610). The connector (610) may output power from the battery pack (1000). Additionally, the connector (610) may charge power to the battery pack (1000). Multiple connectors (610) may be provided.

[0065] The side wall (120) may be provided with a port (620). The port (620) may function as a passage for the inflow or outflow of a cooling fluid (CM). Multiple ports (620) may be provided.

[0066] The BMS (700, battery management system) may be located inside the case. The BMS (700) can control the charging and discharging of the battery module. The BMS (700) can obtain status information of the battery module. In another embodiment, the BMS (700) may be installed outside the case. For example, the BMS (700) installed outside the case may be configured to control a plurality of battery packs (1000).

[0067] The pack cover (150) can be installed, fastened, joined, fixed, or attached to the side wall (120). The pack cover (150) can cover the internal space of the battery pack (1000).

[0068] The battery pack (1000) may include a venting device (500). The venting device (500) may be installed in the base assembly (110). 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 case (100). Multiple venting devices (500) may be provided.

[0069] The battery pack (1000) may include a partition wall (300). The partition wall (300) may include a first partition wall (310) and a second partition wall (320). The partition wall (300) may be provided in multiple numbers. The partition wall (300) may be installed, fastened, fixed, coupled, or attached to the upper surface of the base assembly (110). The partition wall (300) may partition the internal space of the battery pack (1000). The battery module (200) may be located in the space partitioned by the partition wall (300).

[0070] FIG. 3 is a drawing showing the battery module (200) of FIG. 2. FIG. 4 is a drawing showing the battery module (200) of FIG. 3 in a different direction. FIG. 5 is a drawing showing a part of the battery module (200) of FIG. 3 separated. FIG. 6 is a drawing showing the laminate (201) of FIG. 5 separated. FIG. 7 is a drawing showing the change of FIG. 4 when a thermal event occurs.

[0071] Referring to FIGS. 3 through 7, the battery module (200) may include a bottom cover (211). The bottom cover (211) may be provided as a pair. The pair of bottom covers (211) may be arranged along the front-rear direction or the X-axis direction. The bottom cover (211) may form the exterior of the battery module (200). The bottom cover (211) may have a flat shape.

[0072] A venting cover (212) may be positioned between a pair of bottom covers (211). The venting cover (212) may be fastened, coupled, fixed, or attached to a pair of bottom covers (211). The venting cover (212) may cover the space between a pair of bottom covers (211). The venting cover (212) may form the exterior of a battery module (200). The venting cover (212) may include a material with high heat resistance. The venting cover (212) may include a material with high fire resistance. The venting cover (212) may include a material with high thermal insulation. For example, the venting cover (212) may include a mica material.

[0073] The battery module (200) may include a battery cell (220). The battery cell (220) may refer to a secondary battery. For example, the 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.

[0074] The battery cell (220) may be extended along the front-rear direction or the X-axis direction. The battery cell (220) may include a storage portion (221) having an electrode assembly, a first sealing portion (222) protruding toward the front and rear sides of the storage portion (221), and a second sealing portion (223) protruding downward from the storage portion (221). Additionally, the battery cell (220) may include electrode leads (224) protruding from the first sealing portion (222) on the front and rear sides of the storage portion (221), respectively. The electrode leads (224) may protrude toward the front and rear sides of each storage portion (221).

[0075] A plurality of battery cells (220) may be provided. A plurality of battery cells (220) may be located on top of a bottom cover (211). A plurality of battery cells (220) may be located on top of a venting cover (212). A plurality of battery cells (220) may form a laminate (201).

[0076] Multiple battery cells (220) can be stacked along one direction. For example, multiple battery cells (220) can be stacked along the left-right direction or the Y-axis direction.

[0077] When a thermal event occurs, venting gas (G) may be discharged from the battery cell (220). The venting gas (G) may be discharged through the second sealing part (223).

[0078] The battery module (200) may include a cartridge (270). The cartridge (270) may be mounted, coupled, fastened, fixed, or received in the first sealing portion (222) of the battery cell (220). A pair of cartridges (270) may be mounted, coupled, fastened, fixed, or received in the front first sealing portion (222) and the rear first sealing portion (222), respectively. A plurality of cartridges (270) may be provided. A pair of cartridges (270) may be provided to correspond one-to-one with a single battery cell (220). A plurality of cartridges (270) may form a laminate (201).

[0079] The battery module (200) may include a cooling plate (240). The cooling plate (240) may have a flow path (241) inside. A cooling fluid (CM) may flow along the flow path (241). The cooling plate (240) may be in contact with, coupled with, fastened to, or fixed to the battery cell (220). The cooling plate (240) may be provided in multiple numbers. The cooling plate (240) may be stacked along one direction. For example, the cooling plate (240) may be stacked along the left-right direction or the Y-axis direction. The cooling plate (240) may be placed between multiple battery cells (220). For example, the cooling plate (240) may be placed every two battery cells (220). Multiple cooling plates (240) may form a stack (201).

[0080] The cooling plate (240) may have a flat plate shape. The cooling plate (240) may be provided with an inlet (244) and an outlet (245). A flow path (241) may connect the inlet (244) and the outlet (245). A cooling fluid (CM) may be introduced into the inlet (244) and discharged through the outlet (245).

[0081] The first tube (242) and the second tube (243) may be connected. The first tube (242) may be provided in multiple numbers. The second tube (243) may be provided in multiple numbers. The first tube (242) and the second tube (243) may be arranged alternately. The first tube (242) or the second tube (243) may be connected to the inlet (244) of the cooling plate (240). The first tube (242) or the second tube (243) may be connected to the outlet (245) of the cooling plate (240). The first tube (242) and the second tube (243) may be connected to multiple cooling plates (240).

[0082] A pad (250) may be placed between a plurality of battery cells (220). A plurality of pads (250) may be provided. A pad (250) may be placed between at least some of the battery cells (220) and / or outside the stack (201). For example, a pad (250) may be configured to be placed between every two battery cells (220) stacked in the left-right direction. A plurality of pads (250) may form the stack (201).

[0083] These pads (250) may be provided with an elastic material to absorb swelling of the battery cell (220). For example, the pads (250) may be made of a foam material such as polyurethane. Alternatively, the pads (250) may be provided with a material capable of blocking heat or flames. For example, the pads (250) may be provided with an insulating or fireproof material such as silicone or mica.

[0084] A busbar frame assembly (230) may be provided on the front and rear sides of a plurality of battery cells (220), respectively. The busbar frame assembly (230) may be electrically connected to the electrode leads (224) of the plurality of battery cells (220).

[0085] The front busbar frame assembly (230) can be electrically connected to the front electrode leads (224) of a plurality of battery cells (220). The front busbar frame assembly (230) can cover the front of the cooling plate (240). The front busbar frame assembly (230) can cover the front of the pad (250). The front busbar frame assembly (230) can cover the front of the cartridge (270).

[0086] The rear busbar frame assembly (230) can be electrically connected to the rear electrode leads (224) of a plurality of battery cells (220). The rear busbar frame assembly (230) can cover the rear of the cooling plate (240). The rear busbar frame assembly (230) can cover the rear of the pad (250). The rear busbar frame assembly (230) can cover the rear of the cartridge (270).

[0087] A pair of end covers (280) can cover the front and rear sides of the busbar frame assembly (230), respectively. The end covers (280) can have a rectangular shape. A pair of end covers (280) can form the exterior of the battery module (200).

[0088] The front end cover (280) can be fastened, coupled, assembled, or fixed to the front bottom cover (211). The rear end cover (280) can be fastened, coupled, assembled, or fixed to the rear bottom cover (211).

[0089] The control unit (290) may be fastened, coupled, assembled, or fixed to the front end cover (280). The control unit (290) may be provided on the outer surface of the front end cover (280) or on the front surface of the front end cover (280). The control unit (290) may be electrically connected to a plurality of battery cells (220). The control unit (290) may control the charging and discharging of the plurality of battery cells (220). The control unit (290) may obtain status information of the plurality of battery cells (220).

[0090] Side covers (213) may be provided in pairs. Side covers (213) may have a flat shape. Side covers (213) may have a square shape. A pair of side covers (213) may each cover both sides of the laminate (201). Side covers (213) may be fastened, coupled, assembled, or fixed to end covers (280). Side covers (213) may be fastened, coupled, assembled, or fixed to bottom covers (211). Side covers (213) may be fastened, coupled, assembled, or fixed to venting covers (212). A pair of side covers (213) may form the exterior of the battery module (200).

[0091] The top cover (215) may be positioned on top of the laminate (201). The top cover (215) may cover the upper surface of the laminate (201). The top cover (215) may have a flat shape. The top cover (215) may have a square shape. The top cover (215) may form the exterior of the battery module (200). The top cover (215) may be fastened, coupled, assembled, or fixed to the side cover (213). The top cover (215) may be fastened, coupled, assembled, or fixed to the end cover (280).

[0092] The top pad (214) may be positioned between the top cover (215) and the laminate (201). The top cover (215) may have a square shape. The top pad (214) may have a flat shape. The top pad (214) may be provided with an elastic material to absorb swelling of the battery cell (220). For example, the top pad (214) may be composed of a foam material such as polyurethane. Alternatively, the top pad (214) may be provided with a material capable of blocking heat or flames. For example, the top pad (214) may be provided with an insulating material or a fire-resistant material such as silicone or mica. The top pad (214) may be compressed between the top cover (215) and the laminate (201).

[0093] The battery module (200) may include a heat transfer member (260). The heat transfer member (260) may include a material with high thermal conductivity. For example, the heat transfer member (260) may be resin.

[0094] The bottom cover (211) may be provided with a plurality of injection holes (211c). A heat transfer member (260) may be introduced into the interior of the battery module (200) through the injection holes (211c). At this time, the heat transfer member (260) may be in a liquid state. The heat transfer member (260) may be in a liquid state at high temperatures. The injected heat transfer member (260) may become a solid state as the temperature decreases.

[0095] A heat transfer member (260) may be placed between the bottom cover (211) and the laminate (201). The heat transfer member (260) may connect the bottom cover (211) and the laminate (201). The heat transfer member (260) may be placed between the bottom cover (211) and a plurality of battery cells (220). The heat transfer member (260) may connect the plurality of battery cells (220) and the bottom cover (211).

[0096] The heat transfer member (260) may not be placed between the venting cover (212) and the laminate (201).

[0097] A heat transfer member (260) may be positioned between the front busbar frame assembly (230) and the front end cover (280). The heat transfer member (260) may connect the front busbar frame assembly (230) and the front end cover (280). The heat transfer member (260) may be positioned between the rear busbar frame assembly (230) and the rear end cover (280). The heat transfer member (260) may connect the rear busbar frame assembly (230) and the rear end cover (280).

[0098] The venting cover (212) may be provided with a separation line (212b). The separation line (212b, score line) may be used as a general term including a perforated line (212b, perforated line), a notching line (212b, notching line), a cutting line (212b, cutting line), a shredding line (212b, shredding line), a tear line (212b, tear line), or a separation line (212b, separation line). The separation line (212b) may be configured to be easily separated by pressure applied to the venting cover (212).

[0099] The separation line (212b) may have a rectangular trajectory. The portion of the venting cover (212) surrounded by the separation line (212b) may be referred to as the separation part (212c). The venting section (212a) may include the separation line (212b) and the separation part (212c). The separation line (212b) may be provided in multiple numbers. The multiple separation lines (212b) may be arranged along the left-right direction or the Y-axis direction. The separation part (212c) may be provided in multiple numbers. The multiple separation parts (212c) may be arranged along the left-right direction or the Y-axis direction.

[0100] The separation part (212c) can be separated from the venting cover (212) by pressure applied to the venting cover (212). As a result, a venting hole (212d) can be formed in the venting cover (212).

[0101] The venting portion (212a) may face the second sealing portion (223) of the laminate (201). When a thermal event occurs, the venting gas (G) may be discharged through the second sealing portion (223). The venting gas (G) may be discharged in a downward direction or in the -Z axis direction. The venting gas (G) may apply pressure to the separation part (212c). The separation part (212c) may be separated by the venting gas (G), and a venting hole (212d) may be formed. The venting gas (G) may be discharged to the outside of the battery module (200) through the venting hole (212d).

[0102] At this time, the venting hole (212d) may be formed only in the separation part (212c) facing the battery cell (220) where the thermal event occurred. The other separation part (212c) may not be separated. The separation part (212c) that is not separated may block the venting gas (G) from flowing into the interior of the battery module (200).

[0103] FIG. 8 is a drawing showing the base assembly (110) of FIG. 2 in more detail. FIG. 9 is a drawing showing the base assembly (110) of FIG. 8 separated. FIG. 10 is a drawing showing the cross-sectional configuration along the cutting line B-B' of FIG. 8. FIG. 11 is a drawing showing the cross-sectional configuration along the cutting line C-C' of FIG. 8.

[0104] Referring to FIGS. 8 through 11, the base assembly (110) may include a base plate (111). The base plate (111) may have a flat shape. The base plate (111) may have a square shape. The base plate (111) may form the exterior of the battery pack (1000).

[0105] A venting device (500) may be provided on a base plate (111). A plurality of venting devices (500) may be arranged along the front-rear direction or the X-axis direction. The venting device (500) may discharge venting gas (G) in the downward direction or the -Z-axis direction.

[0106] The upper plate (112) can be fastened, coupled, assembled, fixed, or attached to the upper surface of the base plate (111). The upper plate (112) can provide a space inside. The space provided by the upper plate (112) can be referred to as a venting space (VS). The upper plate (112) can be extended along the left-right direction or the Y-axis direction. The upper plate (112) can be provided in multiple numbers. Multiple upper plates (112) can be arranged along the front-rear direction or the X-axis direction. The upper plate (112) may have a shape with both sides open. The upper plate (112) may be provided with multiple inlet holes (112b3). Venting gas (G) discharged from the battery module (200) can be introduced into the interior of the upper plate (112) through the inlet holes (112b3). The venting device (500) can be placed inside the upper plate (112) on the base plate (111). According to one embodiment, a plurality of venting devices (500) may be provided to correspond one-to-one with an upper plate (112). A pair of upper plates (112-1, 112-2) adjacent to each other may have a symmetrical structure.

[0107] The side plates (114) can cover both sides of the upper plate (112). Multiple side plates (114) may be provided. The side plates (114) may be fastened, joined, assembled, fixed, or attached to each side of the upper plate (112).

[0108] The inner plate (113) may be placed inside the upper plate (112). Multiple inner plates (113) may be provided. Multiple inner plates (113) may be provided to correspond one-to-one with the upper plate (112). The inner plate (113) may be fastened, joined, assembled, fixed, or attached to the upper surface of the base plate (111). The inner plate (113) may provide space inside. The inner plate (113) may be extended along the left-right direction or the Y-axis direction. The length of the inner plate (113) in the left-right direction may be configured to be shorter than the length of the upper plate (112) in the left-right direction. Multiple inner plates (113) may be provided. Multiple inner plates (113) may be arranged along the front-back direction or the X-axis direction. The inner plate (113) may have a shape with both sides open. A venting device (500) may be placed inside the inner plate (113). A plurality of venting devices (500) may be provided to correspond one-to-one with the inner plate (113). Venting gas (G) discharged from the battery module (200) may be introduced into the interior of the upper plate (112) through the inlet hole (112b3). Venting gas (G) introduced into the upper plate (112) may be introduced into the interior of the inner plate (113) through both sides of the inner plate (113). Venting gas (G) introduced into the interior of the inner plate (113) may be discharged to the outside of the battery pack (1000) through the venting device (500). The inner plate (113) may extend the flow path of the venting gas (G). As a result, the venting gas (G) may be discharged at a lowered temperature. In addition, by extending the flow path, the emission of particles such as flammable particles can be suppressed.

[0109] FIG. 12 is a diagram showing the cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 13 is a diagram showing the change in FIG. 12 when a thermal event occurs.

[0110] Referring to FIGS. 12 and 13, the upper plate (112) may include a connecting portion (112a). The connecting portion (112a) may be fastened, connected, assembled, fixed, or attached to the upper surface of the base plate (111). The connecting portion (112a) may be provided on the front side and the rear side of the upper plate (112), respectively.

[0111] The upper plate (112) may include a protrusion (112b). The protrusion (112b) may connect a pair of coupling parts (112a). The protrusion (112b) may extend rearward from the front coupling part (112a). The protrusion (112b) may extend forward from the rear coupling part (112a). The protrusion (112b) may provide space inside. The protrusion (112b) may accommodate an inner plate (113). A battery module (200) may be fastened, coupled, assembled, fixed, or attached to the protrusion (112b) from the top.

[0112] The protrusion (112b) may include a support portion (112b1). The support portion (112b1) may be spaced apart from the base plate (111). The battery module (200) may be fastened, coupled, assembled, fixed, or attached to the support portion (112b1). The protrusion (112b) may include an inclined portion (112b2). The inclined portion (112b2) may connect the support portion (112b1) and the coupling portion (112a). The inclined portion (112b2) may have a plurality of inlet holes (112b3).

[0113] The upper plate (112) may include a buffer section (112c). The buffer section (112c) may extend from the connecting section (112a). The buffer section (112c) may extend along the left-right direction or the Y-axis direction. The buffer section (112c) may provide space inside. The buffer section (112c) may be spaced apart from the base plate (111). The buffer section (112c) may extend forward of the connecting section (112a). The buffer section (112c) may extend backward of the connecting section (112a). The buffer sections (112c) of adjacent upper plates (112) may be arranged side by side. The buffer section (112c) may be spaced apart at an angle with respect to the base plate (111). The buffer section (112c) may extend toward the venting section (212a). The buffer section (112c) may face the venting section (212a) of the battery module (200). A pair of buffer sections (112c) may face the venting section (212a) of the battery module (200).

[0114] According to one embodiment, the upper plate (112) may be formed integrally. For example, the connecting portion (112a), the supporting portion (112b1), the inclined portion (112b2), and the cushioning portion (112c) may be formed integrally.

[0115] When a thermal event occurs, the battery module (200) can discharge venting gas (G) through the venting section (212a). The venting gas (G) may collide with the buffer section (112c). By colliding with the venting gas (G), the buffer section (112c) may bend or deform in the downward direction or the -Z axis direction. The buffer section (112c) may absorb the energy of the venting gas (G). The energy of the venting gas (G) may be reduced due to the buffer section (112c). The venting gas (G) with reduced energy may flow into the interior of the upper plate (112) through the inlet hole (112b3). By reducing the energy of the venting gas (G), damage to the battery pack (1000) by the venting gas (G) may be suppressed or prevented.

[0116] The buffer section (112c) may be located between the venting section (212a) and the base plate (111). The buffer section (112c) may be spaced apart from the venting section (212a). In the event of a thermal event, the separation part (212c) may fall downward or bend. By being spaced apart from the venting section (212a), the buffer section (112c) may facilitate the opening of the venting section (212a).

[0117] The height H2 of the buffer section (112c) can be configured to be lower than the height H1 of the protrusion (112b). By configuring the height H2 of the buffer section (112c) to be lower than the height H1 of the protrusion (112b), the buffer section (112c) can facilitate the opening of the venting section (212a).

[0118] FIG. 14 is a drawing showing a modified embodiment of FIG. 12. Referring to FIG. 14, the buffer portion (112c) may be spaced apart from the base plate (111) at a step. The buffer portion (112c) may be positioned parallel to the base plate (111). The gap between the buffer portion (112c) and the base plate (111) may be formed at a constant level. By forming the height of the buffer portion (112c) at a constant level, the venting portion (212a) may be opened more easily.

[0119] FIG. 15 is a drawing showing another modified embodiment of FIG. 12. Referring to FIG. 15, the inclined portion (112b2) may include a convex portion (112b4). The convex portion (112b4) may protrude outward from the inclined portion (112b2). The convex portion (112b4) may be formed integrally with the inclined portion (112b2). The convex portion (112b4) may be formed by bending a part of the inclined portion (112b2). When a thermal event occurs, the convex portion (112b4) may reduce the energy of the venting gas (G) by colliding with the venting gas (G).

[0120] The inclined portion (112b2) may include a concave portion (112b5). The concave portion (112b5) may protrude inwardly from the inclined portion (112b2). The concave portion (112b5) may be formed integrally with the inclined portion (112b2). The concave portion (112b5) may be formed by bending a part of the inclined portion (112b2). When a thermal event occurs, the concave portion (112b5) may reduce the energy of the venting gas (G) by colliding with the venting gas (G).

[0121] FIG. 16 is a drawing showing another modified embodiment of FIG. 12. Referring to FIG. 16, the inclined portion (112b2) may include venting guides (112b6, 112b7). The venting guides (112b6, 112b7) may cover a portion of the inlet hole (112b3). The venting guides (112b6, 112b7) may be formed integrally with the inclined portion (112b2). The venting guides (112b6, 112b7) may be formed by bending a portion of the inclined portion (112b2). When a thermal event occurs, the venting guides (112b6, 112b7) may reduce the energy of the venting gas (G) by colliding with the venting gas (G).

[0122] The venting guide (112b6, 112b7) may include a first venting guide (112b6). The first venting guide (112b6) may protrude outward from the inclined portion (112b2). The venting guide (112b6, 112b7) may include a second venting guide (112b7). The second venting guide (112b7) may protrude inward from the inclined portion (112b2).

[0123] The venting guides (112b6, 112b7) can disperse the flow direction of the venting gas (G). The venting guides (112b6, 112b7) can diffuse the venting gas (G). As the venting gas (G) is dispersed or diffused, the energy density per unit volume can be lowered. As a result, damage to the battery pack (1000) can be prevented.

[0124] FIG. 17 is a drawing showing a vehicle (V) according to one aspect of the present invention. Referring to FIG. 17, the vehicle (V) according to the present invention may include a battery pack (1000) of the present invention.

[0125] The battery pack (1000) according to the present invention may be applied to a vehicle such as an electric vehicle or a hybrid vehicle. The vehicle (V) according to the present invention may further include various other components included in the vehicle in addition to the battery pack (1000). For example, the vehicle (V) according to the present invention may further include a vehicle body, a motor, an electronic control unit (ECU), and other control devices.

[0126] 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. Base plate; An upper plate comprising a coupling portion coupled to the upper surface of the base plate, a protrusion extending rearward from the coupling portion and providing an internal space, and a buffer portion extending forward from the coupling portion and providing an internal space; and, A battery pack comprising a venting portion facing the above-mentioned buffer portion and a battery module in contact with the above-mentioned protrusion.

2. In Paragraph 1, The above buffer unit is, A battery pack spaced apart from the above base plate.

3. In Paragraph 1, The above buffer unit is, A battery pack spaced apart from the above-mentioned venting section.

4. In Paragraph 1, The above buffer unit is, A battery pack extending toward the venting section.

5. In Paragraph 1, The height of the above buffer section is, A battery pack configured to be lower than the height of the above-mentioned protrusion.

6. In Paragraph 1, The above protrusion is: A support member in contact with the above battery module; and, A battery pack comprising an inclined portion that connects the support portion and the coupling portion and has an inlet hole.

7. In Paragraph 6, The above-mentioned inclined portion is, A battery pack including a convex portion protruding outward.

8. In Paragraph 6, The above-mentioned inclined portion is, A battery pack including a recess protruding inward.

9. In Paragraph 6, The above-mentioned inclined portion is, A battery pack including a venting guide covering a portion of the inlet hole.

10. In Paragraph 9, The above venting guide is, A battery pack including a first venting guide extending outwardly to the inclined portion.

11. In Paragraph 9, The above venting guide is, A battery pack including a second venting guide extending inwardly to the inclined portion.

12. In Paragraph 1, A battery pack further comprising a venting device located inside the upper plate and installed on the base plate.

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

14. Base assembly; A side wall installed at the upper corner of the base assembly; and Includes a pack cover installed on the side wall, and The above base assembly is: base plate; and The upper plate includes a coupling portion coupled to the upper surface of the base plate, a protrusion extending rearward from the coupling portion and providing an internal space, and a buffer portion extending forward from the coupling portion and providing an internal space. A battery pack case designed such that the above-mentioned protrusion contacts a battery module from above, and the above-mentioned buffer portion faces the venting portion of the battery module contacted from above.

15. In Paragraph 14, A battery pack case designed such that the above-mentioned protrusion includes a support member installed spaced apart from the base plate, and the battery module can be fastened and installed to the support member from the top.

16. In Paragraph 15, A battery pack case in which the above-mentioned protrusion includes an inclined portion, the inclined portion connects the support portion and the coupling portion, and a plurality of inlet holes are formed in the inclined portion.

17. In Paragraph 14, The above upper plate is a battery pack case formed as a single unit.

18. In Paragraph 14, The height of the above buffer section is, A battery pack case configured to be lower than the height of the above-mentioned protrusion.

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