Battery pack and vehicle including same

Abstract

A battery pack according to the present invention comprises: a cell assembly having a plurality of battery cells; a bottom frame which is provided with a first venting space exposed to the cell assembly, a second venting space communicating with the first venting space, and a third venting space communicating with the second venting space through at least one opening, and which is disposed on one side of the cell assembly; and at least one guide structure which is disposed at a position facing the opening, protrudes toward the opening, and is configured to guide a venting gas flowing in the second venting space to the third venting space.

Description

Battery pack and automobile including the same

[0001] The present invention relates to a battery pack and an automobile including the same, and more specifically, to a battery pack and an automobile including the same that enables smooth venting when a thermal event occurs and effectively prevents heat transfer phenomena.

[0002] This application is a priority claim application for Korean Patent Application No. 10-2024-0162446 filed on November 14, 2024, and all contents disclosed in the specification of said application are incorporated into this application by reference.

[0003] Secondary batteries, which possess electrical characteristics such as high energy density and high applicability across product groups, are widely applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric sources. These secondary batteries are attracting attention as a new energy source for enhancing eco-friendliness and energy efficiency, not only for the primary advantage of drastically reducing the use of fossil fuels but also because they generate no by-products from energy use.

[0004] Currently, widely used types of rechargeable batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. Generally, lithium rechargeable batteries can be classified according to the shape of the casing into can-type rechargeable batteries, in which the electrode assembly is housed in a metal can, and pouch-type rechargeable batteries, in which the electrode assembly is housed in a pouch made of aluminum laminate sheets.

[0005] When a high output voltage is required, multiple battery cells may be connected in series to form a battery module or battery pack. Additionally, to increase charge / discharge capacity, multiple battery cells may be connected in parallel to form a battery module or battery pack. Accordingly, the number of battery cells included in the battery module or pack can be varied depending on the required output voltage or charge / discharge capacity.

[0006] When configuring a battery pack by connecting multiple battery cells in series or parallel, it is common practice to first construct a battery module containing at least one battery cell, and then use this at least one battery module to add other components to form a battery pack or battery rack. Alternatively, recently, battery packs in the form of a "Cell-to-Pack," in which multiple battery cells are directly housed in a pack housing without modularization, are also being manufactured.

[0007] However, when a battery pack contains multiple battery cells in this manner, it may be vulnerable to thermal chain reactions between battery cells or battery modules. For example, if a thermal event, such as thermal runaway, occurs in a single battery cell, this thermal event can be transferred to other battery cells or modules. If this thermal transfer phenomenon is not properly suppressed, a thermal event originating in a specific battery cell can trigger a chain reaction in other battery cells or modules, potentially causing major problems such as explosions or fires.

[0008] The present invention was conceived in consideration of the aforementioned problems and has one objective of providing a battery pack capable of smooth venting when a thermal event occurs, and an automobile including the same.

[0009] In addition, the present invention has another objective of providing a battery pack in which heat transfer phenomena can be effectively prevented and an automobile including the same.

[0010] 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.

[0011] A battery pack according to the present invention comprises: a cell assembly having a plurality of battery cells; a bottom frame disposed on one side of the cell assembly, wherein a first venting space exposed to the cell assembly, a second venting space communicating with the first venting space, and a third venting space communicating with the second venting space through at least one opening are provided; and at least one guide structure disposed at a position facing the opening, protruding toward the opening, and configured to guide a venting gas flowing in the second venting space into the third venting space.

[0012] The above guide structure can be formed symmetrically with respect to the direction toward the opening.

[0013] The above opening includes a first opening formed at one end of the third venting space and a second opening formed at the other end, and the guide structure may be provided corresponding to each of the first opening and the second opening.

[0014] The above guide structure may be formed with at least a portion rounded.

[0015] The outer surface of the above guide structure may be provided in an embossed form.

[0016] The outer surface of the above guide structure may be formed roughly.

[0017] A battery pack according to the present invention further comprises a side wall frame that surrounds the bottom frame to form a receiving space capable of accommodating at least one cell assembly together with the bottom frame, and has a side venting space formed therein through which venting gas can flow, and the guide structure may have a side hole that communicates the second venting space and the side venting space with each other.

[0018] The battery pack according to the present invention may further include a corner guide structure disposed at the corner of the second venting space and formed such that its thickness decreases as it moves toward the guide structure.

[0019] The above corner guide structure can be formed concavely toward the third venting space.

[0020] In the battery pack according to the present invention, in the cell assembly, a plurality of battery cells are stacked and arranged together, and the first venting space may be extended in a direction parallel to the stacking direction of the plurality of battery cells.

[0021] The bottom frame comprises an inner frame disposed on one side of the cell assembly; an outer frame disposed on one side of the inner frame; and a routing frame disposed between the inner frame and the outer frame, wherein the first venting space is formed between the cell assembly and the inner frame, the second venting space is formed between the inner frame and the outer frame, and the third venting space may be formed on the inner side of the routing frame.

[0022] The bottom frame further comprises a cover frame that covers the second venting space, and the guide structure may be disposed on the cover frame.

[0023] The above guide structure may be provided integrally with the above cover frame.

[0024] The above guide structure may be configured to support the inner frame and the outer frame.

[0025] The above bottom frame can be placed at the bottom of the cell assembly.

[0026] The battery pack according to the present invention may further include a venting device capable of communicating the third venting space and the outside of the battery pack with each other.

[0027] The automobile according to the present invention includes at least one battery pack according to the present invention.

[0028] According to the present invention, a battery pack capable of smooth venting when a thermal event occurs and an automobile including the same can be provided.

[0029] In addition, according to one aspect of the present invention, a battery pack in which a heat transfer phenomenon can be effectively prevented and an automobile including the same can be provided.

[0030] In addition, according to one aspect of the present invention, a battery pack in which the flow path of the venting gas can be expanded and an automobile including the same can be provided.

[0031] In addition, according to one aspect of the present invention, a battery pack and an automobile including the same can be provided in which the backflow of venting gas can be effectively prevented.

[0032] In addition, according to one aspect of the present invention, a battery pack in which the flow of sparks, flames, or particulates of venting gas can be effectively suppressed and an automobile including the same can be provided.

[0033] In addition, according to one aspect of the present invention, a battery pack in which the formation of a venting gas vortex can be prevented and an automobile including the same can be provided.

[0034] In addition, according to one aspect of the present invention, a battery pack in which venting gas can be evenly guided and an automobile including the same can be provided.

[0035] In addition, according to one aspect of the present invention, a battery pack with improved structural stability and an automobile including the same can be provided.

[0036] In addition, according to one aspect of the present invention, a battery pack that ensures the safety of the occupant and a vehicle including the same can be provided.

[0037] In addition, according to one aspect of the present invention, a battery pack in which venting gas can be smoothly discharged to the outside of the battery pack and a vehicle including the same can be provided.

[0038] The effects of the present invention are not limited to the effects described above, and unmentioned effects will be clearly understood by those skilled in the art from this specification and the attached drawings.

[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 perspective view showing the overall appearance of a battery pack according to one embodiment of the present invention.

[0041] Figure 2 is a perspective view showing the battery pack of Figure 1 disassembled.

[0042] Figure 3 is a side cross-sectional view showing a part of the AA' section of Figure 1.

[0043] FIG. 4 is a plan view showing a part of the interior of a battery pack according to one embodiment of the present invention.

[0044] FIG. 5 is a plan view showing a guide structure provided in a concave shape inside a battery pack according to a modified example of an embodiment of the present invention.

[0045] FIG. 6 is a plan view showing a guide structure provided in a convex shape inside a battery pack according to a modified example of an embodiment of the present invention.

[0046] FIG. 7 is a plan view showing an uneven surface included on the outer surface of a guide structure inside a battery pack according to another variation of an embodiment of the present invention.

[0047] FIG. 8 is a plan view showing the outer surface of a guide structure formed roughly inside a battery pack according to another variation of one embodiment of the present invention.

[0048] FIG. 9 is a side cross-sectional view showing a part of the BB' section of FIG. 1.

[0049] FIG. 10 is a plan view showing a part of the interior of a battery pack according to another embodiment of the present invention.

[0050] FIG. 11 is a plan view showing a part of the interior of a battery pack according to another embodiment of the present invention.

[0051] FIG. 12 is a plan view showing a corner guide structure provided in a concave shape inside a battery pack according to a modified example of another embodiment of the present invention.

[0052] FIG. 13 is a cross-sectional perspective view showing a bottom frame of a battery pack according to one embodiment of the present invention.

[0053] FIG. 14 is a perspective view showing the bottom frame of FIG. 13 disassembled.

[0054] FIG. 15 is a side cross-sectional view showing an enlarged view of the interior of a bottom frame in a battery pack according to one embodiment of the present invention.

[0055] FIG. 16 is a perspective view showing a cell assembly of a battery pack according to one embodiment of the present invention.

[0056] FIG. 17 is a perspective view showing a vent cover disassembled in a cell assembly of a battery pack according to one embodiment of the present invention.

[0057] FIG. 18 is a drawing showing a vehicle according to one embodiment of the present invention.

[0058] Hereinafter, preferred 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 some of the most preferred embodiments of the invention and do not represent all of the technical ideas of the invention, and that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0060] In this specification, unless otherwise specified, the X-axis direction is referred to as the front-back direction, the Y-axis direction orthogonal to the X-axis direction as the left-right direction, and the Z-axis direction orthogonal to the XY plane as the up-down direction (vertical direction).

[0061]

[0062] FIG. 1 is a perspective view showing the overall appearance of a battery pack according to one embodiment of the present invention, FIG. 2 is a perspective view showing the battery pack of FIG. 1 exploded, FIG. 3 is a side cross-sectional view showing a part of the AA' cross-section of FIG. 1, and FIG. 4 is a plan view showing a part of the interior of a battery pack according to one embodiment of the present invention.

[0063] Hereinafter, a battery pack (10) according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4. A battery pack (10) according to an embodiment of the present invention may include a cell assembly (100), a bottom frame (210), and a guide structure (300).

[0064] In particular, referring to FIGS. 1 and 2, the cell assembly (100) may have a plurality of battery cells (110). The cell assembly (100) may have a predetermined width, length, and height in the X direction, Y direction, and Z direction, respectively. In the cell assembly (100), the plurality of battery cells (110) may be stacked and arranged together. For example, the plurality of battery cells (110) may be stacked along the X-axis direction while standing upright in the Z-axis direction. When the plurality of battery cells (110) are arranged in this manner, it may be easy to control the discharge direction of the venting gas (VG), which will be described later, to one side.

[0065] A battery pack (10) according to one embodiment of the present invention may include a plurality of cell assemblies (100).

[0066] The battery cell (110) may be a secondary battery. The battery cell (110) may be, for example, a pouch-type battery cell (110). However, the battery cell (110) is not limited thereto and may be provided as a cylindrical or prismatic battery cell (110).

[0067] The bottom frame (210) may be positioned on one side of the cell assembly (100). For example, the bottom frame (210) may be positioned on one side of the cell assembly (100) in the Z-axis direction.

[0068] In particular, referring to FIGS. 3 and FIGS. 4, the bottom frame (210) may be provided with a first venting space (VS1), a second venting space (VS2), and a third venting space (VS3). (For reference, FIG. 4 and FIGS. 5, 6, 7, 8, 10, 11, and 12 described later show an example of the internal view of the bottom frame (210) with the second bottom portion (211b), described later, removed.)

[0069] When a thermal event occurs in one or more battery cells (110) of a cell assembly (100), high-temperature gas, flames, and solid discharges may be emitted from the battery cells (110), and such high-temperature gas, flames, and solid discharges may be collectively referred to as venting gas (VG).

[0070] The first venting space (VS1) may be a space exposed to the cell assembly (100) through which the venting gas (VG) discharged from the cell assembly (100) can flow.

[0071] The second venting space (VS2) may be connected to the first venting space (VS1). The second venting space (VS2) may be a space through which the venting gas (VG) discharged from the first venting space (VS1) can flow.

[0072] The third venting space (VS3) may be connected to the second venting space (VS2). The third venting space (VS3) may be a space through which venting gas (VG) discharged from the second venting space (VS2) can flow. The second venting space (VS2) and the third venting space (VS3) may be connected to each other through at least one opening (O1, O2). The opening (O1, O2) may be understood as a portion formed by opening toward the second venting space (VS2) at at least one end of the third venting space (VS3).

[0073] The third venting space (VS3) may be provided, for example, inside the second venting space (VS2). The third venting space (VS3) may be provided in the approximately central area of ​​the second venting space (VS2) when viewed from the Z-axis direction, for example, as shown in FIG. 4.

[0074] Venting gas (VG) discharged from one or more battery cells (110) of the cell assembly (100) into the first venting space (VS1) can flow through the second venting space (VS2) to the third venting space (VS3).

[0075] The guide structure (300) can be positioned facing the openings (O1, O2). Specifically, the guide structure (300) can be positioned in the second venting space (VS2) facing the openings (O1, O2) of the third venting space (VS3). For example, as shown in FIG. 4, the guide structure (300) can be positioned on the X-axis side of the openings (O1, O2).

[0076] The guide structure (300) may protrude toward the openings (O1, O2). Specifically, the guide structure (300) may have a shape in which at least a portion protrudes toward the third venting space (VS3) where the openings (O1, O2) are formed. For example, as shown in FIG. 4, the guide structure (300) may be provided in the shape of a roughly triangle protruding in the X-axis direction toward the openings (O1, O2) (in this case, the thickness direction of the guide structure (300) may be understood to be parallel to the X-axis direction, and the width direction of the guide structure (300) may be understood to be parallel to the Y-axis direction).

[0077] The guide structure (300) can be configured to guide the venting gas (VG) flowing in the second venting space (VS2) in a specific direction. Specifically, the guide structure (300) can be configured to guide the venting gas (VG) flowing in the second venting space (VS2) toward the inside of the third venting space (VS3).

[0078] A battery pack (10) according to one embodiment of the present invention is provided with a first venting space (VS1), a second venting space (VS2), and a third venting space (VS3), so that the flow path of the venting gas (VG) can be effectively expanded, and in the process of the flow of the venting gas (VG), the flow energy of the venting gas (VG) can be reduced quickly and smoothly, and particles such as ash or byproducts can be removed early.

[0079] In addition, a battery pack (10) according to one embodiment of the present invention includes a guide structure (300) configured as described above, so that the venting gas (VG) flowing in the second venting space (VS2) can be guided quickly and smoothly into the interior of the third venting space (VS3). Specifically, the venting gas (VG) discharged from the first venting space (VS1) and flowing in the second venting space (VS2) is guided to flow into the openings (O1, O2) along the outer surface of the guide structure (300), thereby being guided into the interior of the third venting space (VS3). Furthermore, as the venting gas (VG) is guided as described above, the backflow of the venting gas (VG) from the second venting space (VS2) toward the first venting space (VS1) can be effectively prevented. As a result, the battery pack (10) according to one embodiment of the present invention enables smooth venting when a thermal event occurs in one or more battery cells (110) of the cell assembly (100), and also enables effective prevention of heat transfer phenomena.

[0080]

[0081] In particular, referring to FIGS. 3 and 4, the guide structure (300) can be formed symmetrically. Specifically, the guide structure (300) can be formed symmetrically with respect to the direction toward the openings (O1, O2). For example, as shown in FIG. 4, the guide structure (300) can be formed in a triangular shape symmetrically toward both the -Y direction and the +Y direction with respect to the X-axis direction toward the openings (O1, O2).

[0082] Additionally, the most protruding part of the guide structure (300) may correspond to the central position of the opening (O1, O2). For example, as shown in FIG. 4, the corner part protruding in the X-axis direction toward the opening (O1, O2) in the guide structure (300) may correspond to the central position of the width (Y-axis direction) of the opening (O1, O2).

[0083] When the guide structure (300) is configured in this way, the venting gas (VG) can be evenly guided toward the third venting space (VS3) from each side in the width direction of the guide structure (300).

[0084]

[0085] In particular, referring to FIGS. 3 and 4, the openings (O1, O2) may include a first opening (O1) and a second opening (O2). Specifically, the openings (O1, O2) may include a first opening (O1) formed at one end of the third venting space (VS3) and a second opening (O2) formed at the other end of the third venting space (VS3). For example, based on the drawings, the first opening (O1) may be formed at the -X direction side end of the third venting space (VS3), and the second opening may be formed at the +X direction side end of the third venting space (VS3).

[0086] A guide structure (300) may be provided corresponding to each of the first opening (O1) and the second opening (O2). Specifically, the guide structure (300) may include both a guide structure (300) positioned in the second venting space (VS2) facing the first opening (O1) and protruding toward the first opening (O1), and a guide structure (300) positioned in the second venting space (VS2) facing the second opening (O2) and protruding toward the second opening (O2).

[0087] Additionally, each guide structure (300) corresponding to the first opening (O1) and the second opening (O2) may be arranged or formed symmetrically with respect to the third venting space (VS3).

[0088] When the openings (O1, O2) include the first opening (O1) and the second opening (O2) as described above, the third venting space (VS3) can be connected to the second venting space (VS2) on both sides, so that the venting gas (VG) flowing in the second venting space (VS2) can be discharged more smoothly into the third venting space (VS3). Furthermore, when the guide structure (300) is provided corresponding to each of the first opening (O1) and the second opening (O2) as described above, the venting gas (VG) flowing in the second venting space (VS2) can be guided quickly and smoothly into the interior of the third venting space (VS3) from both the first opening (O1) side and the second opening (O2) side.

[0089]

[0090] FIG. 5 is a plan view showing a guide structure provided in a concave shape inside a battery pack according to a modified example of an embodiment of the present invention, and FIG. 6 is a plan view showing a guide structure provided in a convex shape inside a battery pack according to a modified example of an embodiment of the present invention.

[0091] Hereinafter, a battery pack (10) according to a modified example of an embodiment of the present invention will be described in detail with reference to FIGS. 5 and FIGS. 6.

[0092] In a battery pack (10) according to a modified example of one embodiment of the present invention, the guide structure (300) may be formed with at least a portion rounded.

[0093] The guide structure (300) may be formed in a concave shape toward the openings (O1, O2) as shown in FIG. 5. Alternatively, the guide structure (300) may be formed in a convex shape toward the openings (O1, O2) as shown in FIG. 6.

[0094] When the guide structure (300) is formed with at least a portion rounded as described above, the venting gas (VG) can be guided more smoothly from the guide structure (300).

[0095]

[0096] FIG. 7 is a plan view showing an uneven surface included on the outer surface of a guide structure inside a battery pack according to another variation of an embodiment of the present invention, and FIG. 8 is a plan view showing a rough outer surface formed on the outer surface of a guide structure inside a battery pack according to another variation of an embodiment of the present invention.

[0097] Hereinafter, with reference to FIGS. 7 and FIGS. 8, a battery pack (10) according to another variation of one embodiment of the present invention will be described in detail.

[0098] In a battery pack (10) according to another variation of one embodiment of the present invention, the outer surface of the guide structure (300) may be provided in an embossed form or formed roughly.

[0099] The guide structure (300) may be provided in an embossed form including at least one uneven portion (310), as shown in FIG. 7. The uneven portion (310) may have a shape protruding outward from the outer surface of the guide structure (300). The guide structure (300) may also be provided in an embossed form including at least one groove portion (not shown), as shown in FIG. 7. The groove portion may have a shape recessed inward from the outer surface of the guide structure (300).

[0100] As shown in FIG. 8, the guide structure (300) may have a rough outer surface. That is, the outer surface of the guide structure (300) may be formed as a rough surface (320). The rough surface (320) may be formed in a shape of repeated fine protrusions or depressions.

[0101] When the guide structure (300) is configured as described above, the flow of sparks, flames, or fine particles of the venting gas (VG) can be effectively suppressed.

[0102]

[0103] FIG. 9 is a side cross-sectional view showing a part of the BB' cross-section of FIG. 1, and FIG. 10 is a plan view showing a part of the interior of a battery pack according to another embodiment of the present invention.

[0104] Hereinafter, a battery pack (10) according to another embodiment of the present invention will be described in detail with reference to FIGS. 1, FIGS. 2, FIGS. 9 and FIGS. 10.

[0105] A battery pack (10) according to another embodiment of the present invention may further include a side wall frame (220). The side wall frame (220) may surround the bottom frame (210) to form a receiving space capable of accommodating at least one cell assembly (100) together with the bottom frame (210).

[0106] A side venting space (SVS) may be formed inside the side wall frame (220). Venting gas (VG) may flow in the side venting space (SVS).

[0107] The guide structure (300) may be provided with a side hole (SH). The side hole (SH) may connect the second venting space (VS2) and the side venting space (SVS) to each other. The side hole (SH) may be formed by penetrating the thickness direction of the guide structure (300).

[0108] When the battery pack (10) is configured as described above, the venting gas (VG) flowing in the second venting space (VS2) can be distributed to the third venting space (VS3) and the side venting space (SVS), respectively, so that venting can be formed more smoothly.

[0109]

[0110] FIG. 11 is a plan view showing a part of the interior of a battery pack according to another embodiment of the present invention.

[0111] Hereinafter, with reference to FIG. 11, a battery pack (10) according to another embodiment of the present invention will be described in detail.

[0112] A battery pack (10) according to another embodiment of the present invention may further include a corner guide structure (400). The corner guide structure (400) may be placed at a corner of the second venting space (VS2). Here, the term "corner" can be understood as the corner portions on both sides in the width direction of the guide structure (300) in the second venting space (VS2).

[0113] The corner guide structure (400) may be placed on one side in the width direction of the guide structure (300) or on both sides.

[0114] The corner guide structure (400) can be formed so that its thickness decreases as it approaches the guide structure (300). For example, the thickness of the corner guide structure (400) in the X-axis direction can decrease as it approaches the guide structure (300).

[0115] When the battery pack (10) further includes a corner guide structure (400) as described above, when the venting gas (VG) flowing in the second venting space (VS2) flows toward the guide structure (300), the flow of the venting gas (VG) can be formed more smoothly. In addition, the formation of a vortex of the venting gas (VG) at the corner of the second venting space (VS2) can be prevented.

[0116]

[0117] FIG. 12 is a plan view showing a corner guide structure provided in a concave shape inside a battery pack according to a modified example of another embodiment of the present invention.

[0118] Hereinafter, with reference to FIG. 12, a battery pack (10) according to a modified example of another embodiment of the present invention will be described in detail.

[0119] In a battery pack (10) according to a modified example of another embodiment of the present invention, the corner guide structure (400) may be formed concavely. Specifically, the corner guide structure (400) may be formed concavely toward the third venting space (VS3).

[0120] When the corner guide structure (400) is formed as described above, when the venting gas (VG) flowing in the second venting space (VS2) flows toward the guide structure (300), the flow of the venting gas (VG) can be formed more smoothly. In addition, the formation of vortices of the venting gas (VG) at the corners of the second venting space (VS2) can be prevented more effectively.

[0121]

[0122] Again, referring to FIGS. 2 and FIGS. 4, the first venting space (VS1) can be extended. Specifically, the first venting space (VS1) can be extended in a direction parallel to the stacking direction of a plurality of battery cells (110).

[0123] For example, if the stacking direction of a plurality of battery cells (110) is the X-axis direction, the first venting space (VS1) may be formed by extending long in the X-axis direction. The first venting space (VS1) may extend to or beyond the battery cells (110) placed at the outermost sides of the cell assembly (100).

[0124] When the first venting space (VS1) is extended as described above, multiple battery cells (110) can all be accommodated in a single first venting space (VS1).

[0125]

[0126] Meanwhile, in the battery pack (10), a plurality of cell assemblies (100) may be stacked and arranged together, and a first venting space (VS1) may be extended in a direction parallel to the stacking direction of the plurality of cell assemblies (100). In this case, a plurality of cell assemblies (100) may correspond to a single first venting space (VS1).

[0127]

[0128] FIG. 13 is a cross-sectional perspective view showing a bottom frame of a battery pack according to one embodiment of the present invention, FIG. 14 is a perspective view showing the bottom frame of FIG. 13 exploded, and FIG. 15 is a side cross-sectional view showing the interior of the bottom frame of a battery pack according to one embodiment of the present invention in enlarged view.

[0129] Referring to FIGS. 2 to 4, FIGS. 13 and FIGS. 14, the bottom frame (210) may be equipped with an inner frame (211), an outer frame (212), and a routing frame (213).

[0130] The inner frame (211) may be placed on one side of the cell assembly (100). For example, the inner frame (211) may be placed on the lower part of the cell assembly (100).

[0131] The outer frame (212) may be positioned on one side of the inner frame (211). For example, the outer frame (212) may be positioned at the bottom of the inner frame (211). The outer frame (212) may be positioned on the outside of the inner frame (211).

[0132] The routing frame (213) may be positioned between the inner frame (211) and the outer frame (212). For example, the outer frame (212), the routing frame (213), and the inner frame (211) may be positioned sequentially in an upward direction.

[0133] The first venting space (VS1) can be formed between the cell assembly (100) and the inner frame (211). For example, a part of the inner frame (211) may be spaced downward from the cell assembly (100), and the first venting space (VS1) may be formed in the gap that is spaced up and down in this way.

[0134] The second venting space (VS2) can be formed between the inner frame (211) and the outer frame (212). For example, the outer frame (212) may be spaced downward from another part of the inner frame (211), and the second venting space (VS2) may be formed in the gap thus spaced vertically.

[0135] The third venting space (VS3) may be formed inside the routing frame (213). For example, when viewed from the Z-axis direction, the routing frame (213) may be positioned approximately in the center of the second venting space (VS2), and the third venting space (VS3) may be formed inside this routing frame (213).

[0136] When the bottom frame (210) is configured as described above, the first venting space (VS1), the second venting space (VS2), and the third venting space (VS3) can be easily and reliably formed in the bottom frame (210). Additionally, the rigidity of the bottom frame (210) is increased, thereby improving the structural stability of the battery pack (10).

[0137]

[0138] The bottom frame (210) may further be provided with a cover frame (214). The cover frame (214) may cover the second venting space (VS2).

[0139] The cover frame (214) may cover one or both ends of the bottom frame (210) to cover the second venting space (VS2). For example, the cover frame (214) may cover the portion formed open between the inner frame (211) and the outer frame (212) at one or both ends in the X-axis direction. The cover frame (214) may cover, for example, one or both ends in the X-axis direction of the second bottom portion (211b) described later.

[0140] The guide structure (300) can be placed on the cover frame (214). For example, the guide structure (300) can be fixed and placed on the inner side of the cover frame (214) (the side facing the second venting space (VS2)).

[0141] When the guide structure (300) is positioned as described above, the guide structure (300) can be positioned at the very end of the second venting space (VS2), thereby maximizing the second venting space (VS2).

[0142]

[0143] The guide structure (300) may be provided integrally with the cover frame (214). Specifically, the guide structure (300) may be provided to cover the second venting space (VS2), or the cover frame (214) may be provided to guide the venting gas (VG) flowing in the second venting space (VS2) to the third venting space (VS3).

[0144] When the guide structure (300) is provided as described above, the number of parts is reduced, and the productivity of the battery pack (10) can be improved. In addition, the second venting space (VS2) can also be secured to the maximum extent.

[0145]

[0146] Meanwhile, the aforementioned corner guide structure (400) can also be provided integrally with the cover frame (214).

[0147]

[0148] In particular, referring to FIG. 15, the guide structure (300) can be configured to support the inner frame (211) and the outer frame (212).

[0149] Specifically, the guide structure (300) is positioned between the inner frame (211) and the outer frame (212) to support the inner frame (211) and the outer frame (212), respectively. For example, as shown in FIG. 15, the inner frame (211) and the outer frame (212) are positioned at the upper and lower portions of the guide structure (300), respectively, and the guide structure (300) may be provided in a form that extends vertically up to the inner frame (211) and the outer frame (212). Additionally, the guide structure (300) may support the inner frame (211) in an upward direction and support the outer frame (212) in a downward direction.

[0150] When the guide structure (300) is configured as described above, the rigidity of the bottom frame (210) can be strengthened, and the structural stability of the battery pack (10) can be increased.

[0151]

[0152] Meanwhile, the routing frame (213) may have an open bottom and an outer frame (212) may be positioned at the bottom of the routing frame (213) to form a third venting space (VS3) between the routing frame (213) and the outer frame (212). The routing frame (213) may be provided in a form that is extended in the X-axis direction. As shown in FIG. 4, the venting gas (VG) discharged from the first venting space (VS1) to the second venting space (VS2) may flow in the X-axis direction upon hitting the routing frame (213) and be guided toward the openings (O1, O2) by the guide structure (300) to be introduced into the third venting space (VS3).

[0153]

[0154] Referring again to FIGS. 2 and FIGS. 3, the bottom frame (210) may be positioned at the bottom of the cell assembly (100). In this case, a first venting space (VS1) may be provided at the bottom of the cell assembly (100) so that the venting gas (VG) may be discharged in a downward direction, and the battery pack (10) may be configured with a bottom venting structure.

[0155] In the case of a vehicle equipped with a battery pack (10), a passenger, such as a driver, is generally positioned above the battery cells (110). If venting gas (VG) is discharged upwards from the battery cells (110) due to a thermal event, it can pose a significant risk to the passenger's safety. Therefore, as in the present invention, if the battery pack (10) is configured with a lower venting structure, the discharge of venting gas (VG) can be directed downwards, opposite to the passenger, thereby ensuring the passenger's safety.

[0156]

[0157] Again, referring to FIGS. 3 and FIGS. 4, the battery pack (10) according to the present invention may further include a venting device (500).

[0158] The venting device (500) can connect the third venting space (VS3) and the outside of the battery pack (10). The venting device (500) can be configured so that the venting gas (VG) flowing in the third venting space (VS3) can be discharged to the outside.

[0159] The venting device (500) can be placed inside the third venting space (VS3).

[0160] The venting device (500) may be in the form of a simple hole that penetrates at least a portion of the bottom frame (210). Alternatively, it may be configured not only to be completely open, but also to be closed under normal conditions and open when a change in pressure or temperature occurs inside the third venting space (VS3).

[0161] In this way, when the battery pack (10) further includes a venting device (500), there is an advantage that the venting gas (VG) flowing in the third venting space (VS3) can be smoothly discharged to the outside of the battery pack (10).

[0162]

[0163] Meanwhile, the venting device (500) may be provided on the outer frame (212) in the approximately central part of the inner side of the routing frame (213).

[0164]

[0165] Meanwhile, the inner frame (211) may have at least one of a first bottom portion (211a), a second bottom portion (211b), and a side plate portion (211c).

[0166] A first venting space (VS1) may be formed in the first bottom portion (211a). The first bottom portion (211a) may be part of an inner frame (211) spaced downward from the cell assembly (100) so that the first venting space (VS1) is formed. The first bottom portion (211a) may be provided in a concave shape toward the cell assembly (100). The first bottom portion (211a) may be supported upward by an outer frame (212).

[0167] A second venting space (VS2) may be formed in the second bottom portion (211b). The second bottom portion (211b) may be another part of the inner frame (211) spaced upward from the outer frame (212) so as to form the second venting space (VS2). The second bottom portion (211b) may be provided in a convex shape toward the cell assembly (100). The second bottom portion (211b) may support the cell assembly (100) upward. The second bottom portion (211b) may be supported upward by the routing frame (213).

[0168] The side plate (211c) may be configured to connect the first bottom part (211a) and the second bottom part (211b). The first bottom part (211a) and the second bottom part (211b) may be positioned at different heights. For example, with respect to the Z-axis direction, the first bottom part (211a) may be positioned lower than the second bottom part (211b). The side plate (211c) may be configured to connect the first bottom part (211a) and the second bottom part (211b) positioned at different heights in this manner. The side plate (211c) may be provided with at least one connecting hole (H) that connects the first venting space (VS1) and the second venting space (VS2) to each other.

[0169]

[0170] FIG. 16 is a perspective view showing a cell assembly of a battery pack according to one embodiment of the present invention, and FIG. 17 is a perspective view showing a vent cover disassembled from a cell assembly of a battery pack according to one embodiment of the present invention.

[0171] Meanwhile, a battery pack (10) according to one embodiment of the present invention may further include a module case (120) and a vent cover (130), as shown in FIGS. 16 and 17.

[0172] A plurality of battery cells (110) can be accommodated in the module case (120). The module case (120) can form the overall shape of the cell assembly (100). When the cell assembly (100) is equipped with the module case (120), the cell assembly (100) can be composed of a battery module.

[0173] The module case (120) may be provided with a venting hole (VH). The venting hole (VH) may be a hole open toward a first venting space (VS1). The venting hole (VH) may be provided, for example, approximately in the center of the bottom (121) of the module case (120). The venting hole (VH) may be extended along the stacking direction (e.g., X-axis direction) of a plurality of battery cells (110), for example.

[0174] The vent cover (130) can cover the venting hole (VH). The vent cover (130) can be configured to open toward the first venting space (VS1) when a pressure greater than a predetermined size is formed. For example, the vent cover (130) may be provided with an openable / closeable opening / closing part (131). The opening / closing part (131) may be provided, for example, in the form of a slit-processed cut line. The opening / closing part (131) may be provided, for example, in a form that is easy to break by notching or slit-processing in the form of a dotted line. The opening / closing part (131) may be provided corresponding to each battery cell (110) or each bank, which is a unit grouping the battery cells (110). By means of the vent cover (130), the venting gas (VG) passing through the venting hole (VH) from the cell assembly (100) can be effectively prevented from flowing back into the cell assembly (100) through the venting hole (VH).

[0175] The cell assembly (100) may have at least one partition member (140). The partition member (140) may be disposed on the side of the battery cell (110). The partition member (140) may be provided as one or more of a cooling member capable of cooling the battery cell, or a pad member capable of blocking heat or flame.

[0176]

[0177] Meanwhile, referring again to FIGS. 1 and 2, the battery pack (10) according to the present invention may further include a partition frame (230) and a pack lid (240). The partition frame (230) may partition a receiving space formed by a bottom frame (210) and a side wall frame (220), and a plurality of cell assemblies (100) may be correspondingly received in each partitioned receiving space. The pack lid (240) may be provided to cover the receiving space and may be provided to cover the upper part of the receiving space. The bottom frame (210), the side wall frame (220), the partition frame (230), and the pack lid (240) may be collectively referred to as a pack case (200).

[0178]

[0179] Meanwhile, the battery pack (10) according to the present invention may further include various devices for controlling the charging and discharging of battery cells (100), such as a Battery Management System (BMS), a current sensor, a fuse, etc., although not shown.

[0180]

[0181] FIG. 18 is a drawing showing a vehicle according to one embodiment of the present invention.

[0182] Referring to FIG. 18 below, the battery pack (10) 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 (10) according to the present invention. The battery pack (10) may be installed in the vehicle body frame or trunk space under the vehicle seat. Furthermore, the vehicle (V) according to one embodiment of the present invention may include various other components included in the vehicle in addition to the battery pack (10). For example, the vehicle (V) according to one embodiment of the present invention may include, in addition to the battery pack (10) according to one embodiment of the present invention, a vehicle body, a motor, a control device such as an ECU (electronic control unit), etc.

[0183] In addition, it is obvious that the battery pack (10) according to one embodiment of the present invention may also be provided in other devices, mechanisms, and facilities, such as an energy storage system using a secondary battery, in addition to a vehicle (V).

[0184]

[0185] In this specification, terms indicating directions such as up, down, left, right, front, and back have been used; however, 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.

[0186] 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.

[0187] [Explanation of the symbol]

[0188] 10: Battery pack

[0189] 100 : Cell Assembly

[0190] 110: Battery cell

[0191] 120 : Modular case

[0192] 121 : Low

[0193] 130 : Vent cover

[0194] 131 : Opening / closing part

[0195] 140 : Bulkhead member

[0196] 200 : Pack case

[0197] 210 : Bottom frame

[0198] 211 : Inner Frame

[0199] 211a : First bottom part

[0200] 211b : Second bottom part

[0201] 211c : Side panel

[0202] 212 : Outer Frame

[0203] 213: Routing frame

[0204] 214 : Cover Frame

[0205] 220 : Sidewall frame

[0206] 230 : Partition Frame

[0207] 240: Pack Lead

[0208] 300 : Guide structure

[0209] 310 : Uneven part

[0210] 320: Rough surface

[0211] 400 : Corner guide structure

[0212] 500 : Venting device

[0213] H: Chimney hole

[0214] O1 : First opening

[0215] O2: Second opening

[0216] VG: Venting gas

[0217] VH : Venting hole

[0218] VS1: 1st venting space

[0219] VS2 : Second venting space

[0220] VS3 : 3rd venting space

[0221] SH : Sidehole

[0222] SVS: Side venting space

[0223] V : Car

Claims

1. A cell assembly having a plurality of battery cells; A first venting space exposed to the cell assembly, a second venting space communicating with the first venting space, and a third venting space communicating with the second venting space through at least one opening are provided, and a bottom frame disposed on one side of the cell assembly; A battery pack characterized by including at least one guide structure positioned facing the opening and protruding toward the opening, configured to guide the venting gas flowing in the second venting space into the third venting space.

2. In Paragraph 1, The above guide structure is, A battery pack characterized by being formed symmetrically with respect to the direction toward the opening.

3. In Paragraph 1, The above opening is, It includes a first opening formed at one end of the third venting space and a second opening formed at the other end, and The above guide structure is, A battery pack characterized by being provided corresponding to each of the first opening and the second opening.

4. In Paragraph 1, The above guide structure is, A battery pack characterized by having at least a portion formed in a rounded shape.

5. In Paragraph 1, The outer surface of the above guide structure is, A battery pack characterized by being provided in an embossed form.

6. In Paragraph 1, The outer surface of the above guide structure is, A battery pack characterized by being roughly formed.

7. In Paragraph 1, It further includes a side wall frame that surrounds the bottom frame to form a receiving space capable of accommodating at least one cell assembly together with the bottom frame, and has a side venting space formed therein through which venting gas can flow. The above guide structure is, A battery pack characterized by having a side hole that connects the second venting space and the side venting space.

8. In Paragraph 1, It is positioned at the corner of the second venting space mentioned above, and A battery pack characterized by further including a corner guide structure formed such that its thickness decreases as it moves toward the guide structure.

9. In Paragraph 8, The above corner guide structure is, A battery pack characterized by being formed concavely toward the third venting space.

10. In Paragraph 1, In the cell assembly above, A plurality of the above battery cells are stacked and arranged together, The above-mentioned first venting space is, A battery pack characterized by being extended in a direction parallel to the stacking direction of a plurality of the battery cells.

11. In Paragraph 1, The above bottom frame is, An inner frame disposed on one side of the cell assembly above; An outer frame disposed on one side of the inner frame; and A routing frame disposed between the inner frame and the outer frame is provided. The above-mentioned first venting space is, It is formed between the cell assembly and the inner frame, and The above second venting space is, It is formed between the inner frame and the outer frame, and The above third venting space is, A battery pack characterized by being formed on the inner side of the routing frame.

12. In Paragraph 11, The above bottom frame is, Further providing a cover frame that covers the second venting space, The above guide structure is, A battery pack characterized by being placed on the above-mentioned cover frame.

13. In Paragraph 12, The above guide structure is, A battery pack characterized by being provided integrally with the above-mentioned cover frame.

14. In Paragraph 11, The above guide structure is, A battery pack characterized by being configured to support the inner frame and the outer frame.

15. In Paragraph 1, The above bottom frame is, A battery pack characterized by being positioned at the bottom of the cell assembly.

16. In Paragraph 1, A battery pack characterized by further including a venting device capable of communicating the third venting space and the outside of the battery pack with each other.

17. An automobile characterized by including at least one battery pack according to any one of claims 1 to 16.

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