Battery pack

Abstract

A battery pack is disclosed. A battery pack according to an embodiment of the present invention comprises: a battery module including a frame which provides a space therein; and a case accommodating the battery module and including a cover assembly which has a communication hole facing the battery module, wherein the frame may include: a venting hole; and a guide which protrudes from the periphery of the venting hole and is inserted into the communication hole.

Description

battery pack

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

[0002] This application is a priority application for Korean Patent Application No. 10-2025-0024309 filed on February 25, 2025, and all contents disclosed in the specification and drawings of said application are incorporated into this application by reference.

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

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

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

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

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

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

[0009] In particular, if an event such as thermal runaway occurs in a single battery module, gases or flames may be randomly released to the outside. If the release of such gases or flames is not properly controlled, they may be released toward other battery modules, potentially causing a thermal chain reaction in those modules. Specifically, module terminals may be located on the front side of a battery module to provide electrical connections to other battery modules or battery packs, such as module busbars. Therefore, if flames are released toward the front of such a battery module, they can damage the module terminals within the battery pack and cause an electrical short circuit. Furthermore, since other battery modules may be located in front of a specific battery module, if flames are released toward the front of that module, the emitted flames may spread toward other modules, making it easy for fire to spread between battery modules.

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

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

[0012] Therefore, a structure is required that allows venting gas to be smoothly discharged even if the battery pack structure is deformed due to the occurrence of a thermal event.

[0013] Accordingly, the present invention is devised to solve the above-mentioned problems and aims to provide a battery pack with an improved structure that can maintain the venting structure of the battery pack even when a thermal event occurs, and a vehicle including the same.

[0014] Another objective of the present invention may be to provide a structure capable of rapidly discharging venting gas.

[0015] Another objective of the present invention may be to provide a structure capable of improving the thermal stability of a battery pack.

[0016] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by those skilled in the art from the description of the invention below.

[0017] A battery pack according to one embodiment of the present invention for achieving the above-mentioned purpose comprises: a battery module including a frame that provides an internal space; and a case including a cover assembly that accommodates the battery module and has a communication hole facing the battery module, wherein the frame may include: a venting hole; and a guide that protrudes from the periphery of the venting hole and is inserted into the interior of the communication hole.

[0018] Additionally, the battery module further includes a battery cell disposed inside the frame, and the venting hole may face the battery cell.

[0019] In addition, the guide may extend along the circumference of the venting hole.

[0020] In addition, the venting hole and the guide may be provided in multiple numbers.

[0021] In addition, the venting hole and the guide can be connected.

[0022] Additionally, the cover assembly is a top cover assembly located above the battery module, and the case further includes a bottom cover assembly located below the battery module, and the communication hole is formed on the lower surface of the top cover assembly, and the guide can protrude upward.

[0023] Additionally, the case further comprises: a side wall communicating with the top cover assembly; and a venting device installed in the side wall, wherein the communicating hole may communicate with the venting device.

[0024] Additionally, the cover assembly is a bottom cover assembly located below the battery module, and the case further includes a top cover assembly located above the battery module, and the communication hole is formed on the upper surface of the bottom cover assembly, and the guide can protrude downward.

[0025] Additionally, the case further comprises: a side wall communicating with the bottom cover assembly; and a venting device installed in the side wall, wherein the communicating hole may communicate with the venting device.

[0026] In addition, 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.

[0027] According to at least one of the embodiments of the present invention, the venting structure of the battery pack can be stably maintained even if a thermal event occurs.

[0028] According to at least one of the embodiments of the present invention, venting gas can be rapidly discharged.

[0029] According to at least one of the embodiments of the present invention, the thermal stability of the battery pack can be improved.

[0030] 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.

[0031] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention.

[0032] Figure 2 is a diagram showing a partial configuration of the battery pack of Figure 1 separated.

[0033] Figure 3 is a diagram showing a partial configuration of the battery pack of Figure 2 separated.

[0034] Figure 4 is a drawing showing the battery module of Figure 3.

[0035] Figure 5 is a diagram showing a partial configuration of the battery module of Figure 4 separated.

[0036] Figure 6 is an enlarged view of the cross-sectional configuration along the cutting line A-A' of Figure 1.

[0037] Figure 7 is an enlarged view of the cross-sectional configuration along the cutting line A-A' of Figure 1.

[0038] FIG. 8 is a drawing showing a battery pack according to another embodiment of the present invention.

[0039] Figure 9 is a diagram showing a partial configuration of the battery pack of Figure 8 separated.

[0040] Figure 10 is a diagram showing a partial configuration of the battery pack of Figure 9 separated.

[0041] Figure 11 is a drawing showing the battery module of Figure 10.

[0042] FIG. 12 is a diagram showing a partial configuration of the battery module of FIG. 11 separated.

[0043] FIG. 13 is a bottom perspective view of the lower frame of FIG. 12.

[0044] FIG. 14 is an enlarged view of the cross-sectional configuration along the cutting line B-B' of FIG. 8.

[0045] FIG. 15 is an enlarged view of the cross-sectional configuration along the cutting line B-B' of FIG. 8.

[0046] FIG. 16 is a drawing showing a vehicle according to one aspect of the present invention.

[0047] 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.

[0048] 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.

[0049] FIG. 1 is a drawing showing a battery pack (1000a) according to an embodiment of the present invention. FIG. 2 is a drawing showing a partial configuration of the battery pack (1000a) of FIG. 1 separated. FIG. 3 is a drawing showing a partial configuration of the battery pack (1000a) of FIG. 2 separated.

[0050] Referring to FIGS. 1 to 3, a battery pack (1000a) according to one embodiment of the present invention may include a case (100). The case (100) may include a bottom cover assembly (110). The bottom cover assembly (110) may have a rectangular shape. The bottom cover assembly (110) may have a flat shape. The bottom cover assembly (110) may form the exterior of the battery pack (1000a). The bottom cover assembly (110) may provide an internal space of the battery pack (1000a).

[0051] The case (100) may include a side wall (120). The side wall (120) may be installed, fastened, joined, fixed, or attached to the upper surface of the bottom cover assembly (110). The side wall (120) may consist of four parts. The side wall (120) may be arranged along the perimeter of the bottom cover assembly (110). The side wall (120) may form the exterior of the battery pack (1000a). The side wall (120) may provide space inside.

[0052] The case (100) may include a top cover assembly (150). The top cover assembly (150) may have a square plate shape. The top cover assembly (150) may have a flat plate shape. The top cover assembly (150) may form the exterior of the battery pack (1000a). The top cover assembly (150) may cover the internal space of the battery pack (1000a).

[0053] The top cover assembly (150) may include a first upper plate (151) and a first lower plate (152). The first upper plate (151) may have a square shape. The first upper plate (151) may form the exterior of the battery pack (1000a). The first lower plate (152) may have a square shape. The first lower plate (152) may form the exterior of the battery pack (1000a). The first upper plate (151) may be placed on top of the first lower plate (152). The top cover assembly (150) may include a first discharge channel (153) inside. The first discharge channel (153) may be placed between the first upper plate (151) and the first lower plate (152). The top cover assembly (150) may include a first communication hole (152a). The first communication hole (152a) may be formed on the lower surface of the top cover assembly (150). The first communication hole (152a) may be formed in the first lower plate (152). The first communication hole (152a) may be in communication with the first discharge channel (153). The first communication hole (152a) may extend along the front-rear direction or the X-axis direction. The first communication hole (152a) may be provided in multiple numbers. The multiple first communication holes (152a) may be arranged along the left-right direction or the Y-axis direction. The multiple first communication holes (152a) may be arranged along the front-rear direction or the X-axis direction.

[0054] The battery pack (1000a) 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 bottom cover assembly (110). The partition wall (300) may partition the internal space of the battery pack (1000a). The first partition wall (310) may extend along the front-rear direction or the X-axis direction. The first partition wall (310) may be provided in multiple numbers. Multiple first partition walls (310) may be arranged along the left-right direction or the Y-axis direction. The second partition wall (320) may extend along the left-right direction or the Y-axis direction.

[0055] A battery pack (1000a) may include a battery module (200). The battery module (200) may include a plurality of battery cells (220, see FIG. 5). In this case, the battery cell (220) may refer to a secondary battery. In particular, 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. The battery module (200) or the battery cell (220) may be located in a space partitioned by a partition wall (300).

[0056] The battery pack (1000a) may include a venting device (500). The venting device (500) may be installed on the 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 case (100) increases. Additionally, the venting device (500) may block external air from entering the case (100). Multiple venting devices (500) may be provided.

[0057] FIG. 4 is a drawing showing the battery module (200) of FIG. 3. FIG. 5 is a drawing showing a partial configuration of the battery module (200) of FIG. 4 separated.

[0058] Referring to FIGS. 4 and 5, the frame (210) may have a rectangular shape. The frame (210) may form the exterior of the battery module (200). The frame (210) may provide space inside. The frame (210) may include a top plate (211) and a lower frame (212).

[0059] The top plate (211) may be provided with a first venting hole (211a). The first venting hole (211a) may extend along the front-rear direction or the X-axis direction. The first venting hole (211a) may be provided in multiple numbers. The multiple first venting holes (211a) may be arranged along the left-right direction or the Y-axis direction. The multiple first venting holes (211a) may be arranged along the front-rear direction or the X-axis direction.

[0060] The top plate (211) may include a first guide (211b). The first guide (211b) may protrude from the circumference of the first venting hole (211a). The first guide (211b) may protrude upward or in the +Z axis direction. The first guide (211b) may extend along the circumference of the first venting hole (211a). The first guide (211b) may be provided in multiple numbers. The first guide (211b) may be provided to correspond one-to-one with the first venting hole (211a). The first guide (211b) may be provided for each first venting hole (211a). For example, the first guide (211b) may be formed through a press burring process.

[0061] When a thermal event occurs, the venting gas (G) can be discharged through the first venting hole (211a). The first guide (211b) can guide the flow of the venting gas (G) upward or in the +Z axis direction.

[0062] A battery cell (220) may be accommodated inside a frame (210). A plurality of battery cells (220) may be provided. A battery cell (220) may be extended along the front-rear direction or the X-axis direction. A 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 above 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). Additionally, the battery cell (220) may include electrode leads (224) protruding to the front and rear sides of the first sealing portion (222), respectively. The electrode leads (224) may protrude forward and backward from each battery cell (220). Multiple 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 secures 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). Multiple adhesive members (225) may be provided. Multiple adhesive members (225) may be arranged along the front-rear direction or the X-axis direction.

[0063] 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.

[0064] 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.

[0065] 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).

[0066] 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).

[0067] The lower frame (212) may include a bottom plate (212a). A battery cell (220) may be placed between the bottom plate (212a) and the top plate (211). A battery cell (220) may be placed on top of the bottom plate (212a). A battery cell (220) may be placed below the top plate (211).

[0068] 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).

[0069] 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).

[0070] The first heat transfer member (261) may be positioned between the bottom plate (212a) and the battery cell (220). The first heat transfer member (261) may be positioned between the storage portion (221) and 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) may combine or attach the bottom plate (212a) and the battery cell (220). The first heat transfer member (261) may be positioned between the front end of the bottom plate (212a) and the second venting hole (212a1). The first heat transfer member (261) may be positioned between the second venting hole (212a1).

[0071] The second heat transfer member (262) may be positioned between the bottom plate (212a) and the battery cell (220). The second heat transfer member (262) may be positioned between the storage portion (221) and 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) may combine or attach the bottom plate (212a) and the battery cell (220). The second heat transfer member (262) may be positioned between the rear end of the bottom plate (212a) and the second venting hole (212a1). The second heat transfer member (262) may be positioned between the second venting hole (212a1).

[0072] A pair of end covers (270) can be coupled, fastened, attached, or assembled to the front and rear sides of the frame (210), respectively. A pair of end covers (270) can cover the front and rear sides of the frame (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 the bottom plate (212a). The end covers (270) can be coupled, fastened, attached, or assembled to a pair of side plates (212c). The end covers (270) can have a square shape. The end covers (270) can form the exterior of the battery module (200).

[0073] 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).

[0074] Figure 6 is an enlarged view of the cross-sectional configuration along the cutting line A-A' of Figure 1.

[0075] Referring to FIG. 6, the first guide (211b) can be inserted into the top cover assembly (150). The first guide (211b) can be inserted into the first lower plate (152). The first guide (211b) can be inserted into the first communication hole (152a). The first guide (211b) can be located inside the first communication hole (152a). The first guide (211b) can be located in the first discharge channel (153).

[0076] The first venting hole (211a) may be connected to the first communication hole (152a). The first venting hole (211a) may be connected to the first discharge path (153).

[0077] The first guide (211b) can connect the first venting hole (211a) and the first communication hole (152a). The first guide (211b) can connect the first venting hole (211a) and the first discharge path (153).

[0078] The first venting hole (211a) may face the battery cell (220). When a thermal event occurs, the venting gas (G) may flow into the first discharge path (153) through the first venting hole (211a). The first guide (211b) may guide the venting gas (G) to flow into the first discharge path (153). When a thermal event occurs, the battery pack (1000a) may partially expand or deform. The first guide (211b) may connect the first venting hole (211a) and the first discharge path (153) even if the battery pack (1000a) expands or deforms. As a result, the thermal stability of the battery pack (1000a) may be improved.

[0079] The first guide (211b) may be fastened, coupled, fixed, or attached to the first communication hole (152a).

[0080] Figure 7 is an enlarged view of the cross-sectional configuration along the cutting line A-A' of Figure 1.

[0081] Referring to FIG. 7, the first lower plate (152) may have a first discharge hole (154). The first discharge hole (154) may be in communication with a first discharge path (153).

[0082] The side wall (120) may include a first inlet hole (120a). A first discharge hole (154) may be in communication with the side wall (120). A first discharge hole (154) may be in communication with the first inlet hole (120a). A first discharge hole (154) may be in communication with a venting device (500) installed in the side wall (120). Venting gas (G) introduced into the first discharge path (153) may be discharged to the outside of the battery pack (1000a) through the first discharge hole (154), the first inlet hole (120a), and the venting device (500).

[0083] FIG. 8 is a drawing showing a battery pack (1000b) according to an embodiment of the present invention. FIG. 9 is a drawing showing a partial configuration of the battery pack (1000b) of FIG. 8 separated. FIG. 10 is a drawing showing a partial configuration of the battery pack (1000b) of FIG. 9 separated.

[0084] Referring to FIGS. 8 through 10, a battery pack (1000b) according to one embodiment of the present invention may include a case (100). The case (100) may include a bottom cover assembly (110). The bottom cover assembly (110) may have a rectangular shape. The bottom cover assembly (110) may have a flat shape. The bottom cover assembly (110) may form the exterior of the battery pack (1000b). The bottom cover assembly (110) may provide an internal space of the battery pack (1000b).

[0085] The bottom cover assembly (110) may include a second upper plate (111) and a second lower plate (118). The second upper plate (111) may have a square shape. The second upper plate (111) may form the exterior of the battery pack (1000b). The second lower plate (118) may have a square shape. The second lower plate (118) may form the exterior of the battery pack (1000b). The second upper plate (111) may be placed on top of the second lower plate (118). The bottom cover assembly (110) may include a second discharge channel (112) inside. The second discharge channel (112) may be placed between the second upper plate (111) and the second lower plate (118). The bottom cover assembly (110) may include a second communication hole (114). The second communication hole (114) may be formed on the upper surface of the bottom cover assembly (110). The second communication hole (114) may be formed in the second upper plate (111). The second communication hole (114) may be in communication with the second discharge channel (112). The second communication hole (114) may extend along the front-rear direction or the X-axis direction. The second communication hole (114) may be provided in multiple numbers. The multiple second communication holes (114) may be arranged along the left-right direction or the Y-axis direction. The multiple second communication holes (114) may be arranged along the front-rear direction or the X-axis direction.

[0086] The case (100) may include a side wall (120). The side wall (120) may be installed, fastened, joined, fixed, or attached to the upper surface of the bottom cover assembly (110). The side wall (120) may consist of four parts. The side wall (120) may be arranged along the perimeter of the bottom cover assembly (110). The side wall (120) may form the exterior of the battery pack (1000b). The side wall (120) may provide space inside.

[0087] The case (100) may include a top cover assembly (150). The top cover assembly (150) may have a square plate shape. The top cover assembly (150) may have a flat plate shape. The top cover assembly (150) may form the exterior of the battery pack (1000b). The top cover assembly (150) may cover the internal space of the battery pack (1000b).

[0088] The battery pack (1000b) 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 bottom cover assembly (110). The partition wall (300) may partition the internal space of the battery pack (1000b). The first partition wall (310) may extend along the front-rear direction or the X-axis direction. The first partition wall (310) may be provided in multiple numbers. Multiple first partition walls (310) may be arranged along the left-right direction or the Y-axis direction. The second partition wall (320) may extend along the left-right direction or the Y-axis direction.

[0089] A battery pack (1000b) may include a battery module (200). The battery module (200) may include a plurality of battery cells (220, see FIG. 12). In this case, the battery cell (220) may refer to a secondary battery. In particular, 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. The battery module (200) or the battery cell (220) may be located in a space partitioned by a partition wall (300).

[0090] The battery pack (1000b) may include a venting device (500). The venting device (500) may be installed on the 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 case (100) increases. Additionally, the venting device (500) may block external air from entering the case (100). Multiple venting devices (500) may be provided.

[0091] FIG. 11 is a drawing showing the battery module (200) of FIG. 10. FIG. 12 is a drawing showing a partial configuration of the battery module (200) of FIG. 11 separated. FIG. 13 is a bottom perspective view of the lower frame of FIG. 12.

[0092] Referring to FIGS. 11 to 13, the frame (210) may have a rectangular shape. The frame (210) may form the exterior of the battery module (200). The frame (210) may provide space inside. The frame (210) may include a top plate (211) and a lower frame (212).

[0093] A battery cell (220) may be accommodated inside a frame (210). A plurality of battery cells (220) may be provided. A battery cell (220) may be extended along the front-rear direction or the X-axis direction. A battery cell (220) may have 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). Additionally, the battery cell (220) may include electrode leads (224) protruding to the front and rear sides of the first sealing portion (222), respectively. The electrode leads (224) may protrude forward and backward from each battery cell (220). Multiple 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 secures 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). Multiple adhesive members (225) may be provided. Multiple adhesive members (225) may be arranged along the front-rear direction or the X-axis direction.

[0094] 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.

[0095] Such barriers (250) may be provided with an elastic material to enable absorption of swelling of the battery cells (220). For example, the barrier (250) may be composed of a foam material such as polyurethane. Alternatively, the barrier (250) may be provided with a material capable of blocking heat or flames. For example, the barrier (250) may be provided with an insulating or fireproof material such as silicone or mica.

[0096] 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).

[0097] 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).

[0098] The lower frame (212) may include a bottom plate (212a). A battery cell (220) may be placed between the bottom plate (212a) and the top plate (211). A battery cell (220) may be placed on top of the bottom plate (212a). A battery cell (220) may be placed below the top plate (211).

[0099] 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).

[0100] The bottom plate (212a) may be provided with a second venting hole (212a1). The second venting hole (212a1) may extend along the front-rear direction or the X-axis direction. The second venting hole (212a1) may be provided in multiple numbers. The multiple second venting holes (212a1) may be arranged along the left-right direction or the Y-axis direction. The multiple second venting holes (212a1) may be arranged along the front-rear direction or the X-axis direction.

[0101] The bottom plate (212a) may include a second guide (212a2). The second guide (212a2) may protrude from the perimeter of the second venting hole (212a1). The second guide (212a2) may protrude downward or in the direction of the -Z axis. The second guide (212a2) may extend along the perimeter of the second venting hole (212a1). The second guide (212a2) may be provided in multiple numbers. The second guide (212a2) may be provided to correspond one-to-one with the second venting hole (212a1). The second guide (212a2) may be provided for each second venting hole (212a1). For example, the second guide (212a2) may be formed through a press burring process.

[0102] When a thermal event occurs, the venting gas (G) can be discharged through the second venting hole (212a1). The second guide (212a2) can guide the flow of the venting gas (G) downward or in the -Z axis direction.

[0103] 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).

[0104] The first heat transfer member (261) may be positioned between the bottom plate (212a) and the battery cell (220). The first heat transfer member (261) may be positioned between the storage portion (221) and 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) may combine or attach the bottom plate (212a) and the battery cell (220).

[0105] The second heat transfer member (262) may be positioned between the bottom plate (212a) and the battery cell (220). The second heat transfer member (262) may be positioned between the storage portion (221) and 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) may combine or attach the bottom plate (212a) and the battery cell (220).

[0106] A pair of end covers (270) can be coupled, fastened, attached, or assembled to the front and rear sides of the frame (210), respectively. A pair of end covers (270) can cover the front and rear sides of the frame (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 the bottom plate (212a). The end covers (270) can be coupled, fastened, attached, or assembled to a pair of side plates (212c). The end covers (270) can have a square shape. The end covers (270) can form the exterior of the battery module (200).

[0107] 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).

[0108] FIG. 14 is an enlarged view of the cross-sectional configuration along the cutting line B-B' of FIG. 8.

[0109] Referring to FIG. 14, the second guide (212a2) can be inserted into the bottom cover assembly (110). The second guide (212a2) can be inserted into the second upper plate (111). The second guide (212a2) can be inserted into the second communication hole (114). The second guide (212a2) can be located inside the second communication hole (114). The second guide (212a2) can be located in the second discharge channel (112).

[0110] The second venting hole (212a1) may be connected to the second communication hole (114). The second venting hole (212a1) may be connected to the second discharge path (112).

[0111] The second guide (212a2) can connect the second venting hole (212a1) and the second communication hole (114). The second guide (212a2) can connect the second venting hole (212a1) and the second discharge path (112).

[0112] The second venting hole (212a1) may face the battery cell (220). When a thermal event occurs, the venting gas (G) may flow into the second discharge path (112) through the second venting hole (212a1). The second guide (212a2) may guide the venting gas (G) to flow into the second discharge path (112). When a thermal event occurs, the battery pack (1000b) may partially expand or deform. The second guide (212a2) may connect the second venting hole (212a1) and the second discharge path (112) even if the battery pack (1000b) expands or deforms. As a result, the thermal stability of the battery pack (1000b) may be improved.

[0113] The second guide (212a2) may be fastened, coupled, fixed, or attached to the second communication hole (114).

[0114] FIG. 15 is an enlarged view of the cross-sectional configuration along the cutting line B-B' of FIG. 8.

[0115] Referring to FIG. 15, the second upper plate (111) may have a second discharge hole (115). The second discharge hole (115) may be in communication with the second discharge path (112).

[0116] The side wall (120) may include a second inlet hole (120b). The second discharge hole (115) may be in communication with the side wall (120). The second discharge hole (115) may be in communication with the second inlet hole (120b). The second discharge hole (115) may be in communication with a venting device (500) installed in the side wall (120). Venting gas (G) introduced into the second discharge path (112) may be discharged to the outside of the battery pack (1000b) through the second discharge hole (115), the second inlet hole (120b), and the venting device (500).

[0117] FIG. 16 is a drawing showing a vehicle (V) according to one aspect of the present invention.

[0118] Referring to FIG. 16, the battery pack (1000a, 1000b) according to the present invention can be applied to a vehicle (V), such as an electric vehicle or a hybrid vehicle. That is, the vehicle (V) according to the present invention may include the battery pack (1000a, 1000b) according to the present invention. In addition, the vehicle (V) according to the present invention may further include various other components included in the vehicle in addition to the battery pack (1000a, 1000b). For example, the vehicle (V) according to the present invention may further include a vehicle body, a motor, a control device such as an ECU (electronic control unit), etc.

[0119] The battery pack (1000a, 1000b) according to the present invention may further include various components of a battery pack known at the time of filing the present invention, such as a BMS, a busbar, a relay, a current sensor, etc.

[0120] 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.

[0121] 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 battery module including a frame that provides space inside; and, A case comprising a cover assembly that accommodates the battery module and has a communication hole facing the battery module, and The above frame is: Venting hole; and, A battery pack including a guide that protrudes from the circumference of the venting hole and is inserted into the interior of the communication hole.

2. In Paragraph 1, The above battery module is, It further includes a battery cell disposed inside the above frame, and The above venting hole is, A battery pack facing the above battery cell.

3. In Paragraph 1, The above guide is, A battery pack extending along the perimeter of the above-mentioned venting hole.

4. In Paragraph 1, A battery pack having multiple venting holes and guides.

5. In Paragraph 1, The above venting hole and the above guide are connected to the battery pack.

6. In Paragraph 1, The above cover assembly is, It is a top cover assembly located on top of the battery module, and The above case is, It further includes a bottom cover assembly located below the battery module, and The above communication hole is, Formed on the lower surface of the top cover assembly above, and The above guide is a battery pack that protrudes upward.

7. In Paragraph 6, The above case is: A side wall communicating with the top cover assembly above; and, It further includes a venting device installed on the side wall, and The above communication hole is, A battery pack connected to the above-mentioned venting device.

8. In Paragraph 1, The above cover assembly is, It is a bottom cover assembly located below the battery module above, and The above case is, It further includes a top cover assembly located on top of the battery module, and The above communication hole is, Formed on the upper surface of the above bottom cover assembly, and The above guide is a battery pack that protrudes downward.

9. In Paragraph 8, The above case is: A side wall communicating with the above-mentioned bottom cover assembly; and, It further includes a venting device installed on the side wall, and The above communication hole is, A battery pack connected to the above-mentioned venting device.

10. An automobile comprising a battery pack according to any one of claims 1 to 9.

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