Battery pack and vehicle including same

Abstract

The present invention relates to a battery pack comprising: a plurality of battery cells; a pack case for accommodating the plurality of battery cells; a module cover for covering the outside of the battery cells; and a blocking member for guiding, in the outside space of the module cover, emissions discharged from the battery cells.

Description

Battery pack and vehicle including same

[0001] The present invention relates to a battery pack and a vehicle including the same.

[0002] This application claims priority to Korean Patent Application No. 10-2023-0159748, filed on November 17, 2023, and all contents disclosed in the specification and drawings of the said application are incorporated by reference into this application.

[0003] This application claims priority to Korean Patent Application No. 10-2024-0145821, filed on October 23, 2024, and all contents disclosed in the specification and drawings of the said application are incorporated herein by reference.

[0004] Secondary batteries, which boast high electrical properties such as high energy density and easy applicability across a wide range of product categories, are widely used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) powered by electrical power sources. These batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency, not only because they can dramatically reduce fossil fuel use, but also because they produce no byproducts from energy use.

[0005] Commonly used secondary batteries today include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. When high output voltage is required, multiple battery cells are connected in series to form a battery module or battery pack. Furthermore, to increase charge / discharge capacity, multiple battery cells are connected in parallel to form a battery module or pack. Therefore, the number of battery cells included in a battery module or pack can vary depending on the required output voltage or charge / discharge capacity.

[0006] Meanwhile, since battery cells undergo chemical reactions during charging and discharging, their performance can deteriorate if used in environments above their optimal temperature. Furthermore, if thermal control fails to maintain optimal temperatures, there's a constant risk of unexpected fire or explosion. Therefore, if a thermal event, such as thermal runaway, occurs within a battery pack containing multiple battery modules, the high-temperature gases or flames emitted from the battery cells could spread to adjacent battery modules, potentially triggering a chain reaction of battery module explosions, posing a significant risk.

[0007] Therefore, when a thermal runaway occurs in a battery module, there is a need to develop a structure that can quickly discharge high-temperature gases or flames generated inside the battery module to the outside, thereby relieving heat accumulation inside the battery module.

[0008] In addition, there is a need to develop a structure that can prevent emitted gas or flames from flowing into the interior of adjacent battery modules when thermal runaway occurs in a battery module.

[0009] Therefore, the problem to be solved by the present invention is to provide a battery pack with improved safety and reliability by minimizing the thermal energy received by adjacent battery modules when thermal runaway occurs in a battery module, thereby preventing or suppressing the propagation of thermal runaway between battery modules.

[0010] In addition, another problem that the present invention seeks to solve is to provide a vehicle including such a battery pack.

[0011] However, the problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0012] To solve the above problem, the present invention provides a battery pack comprising: a plurality of battery cells; a pack case configured to accommodate the plurality of battery cells; and a module cover configured to cover the outer side of the battery cells, and a blocking member configured to guide exhaust gases discharged from the battery cells to an outer space of the module cover.

[0013] The module case further comprises a group of the plurality of battery cells and at least one venting hole formed on one side thereof, and the module cover may be configured to cover one side of the module case where the venting hole is formed.

[0014] The above module cases are provided in multiple numbers, and the module cover can be configured to cover the upper portion of at least some of the multiple module cases.

[0015] The above module cover can be placed at a predetermined distance from the above module case.

[0016] The above blocking member may include a stopper interposed between the module case and the module cover.

[0017] The stopper may be configured to limit a distance between the module case and the module cover.

[0018] The above module cover may be configured to be seated on the stopper.

[0019] The above stopper can be placed between the venting holes.

[0020] The above stopper may be configured to be elongated in at least one direction.

[0021] The above module cover may include an opening configured to open by pressure or heat to discharge the effluent to the outside.

[0022] The above blocking member may include a guide member disposed on the outside of the module cover in a form that extends long along at least one direction.

[0023] The above guide members are provided in multiple units spaced apart from each other by a predetermined distance in the horizontal direction, and a venting path configured to allow the discharge to flow can be formed between the guide members.

[0024] The pack case may include a venting portion configured to discharge the discharge to the outside of the pack case, and the guide member may be configured to guide the discharge to the venting portion.

[0025] The above guide member may be configured such that the area of ​​the venting path becomes smaller as at least a portion of the venting path gets closer to the venting portion.

[0026] The above guide member may be provided in multiple numbers and arranged to be spaced apart from each other by a predetermined distance in the longitudinal direction.

[0027] In addition, the present invention provides a battery pack characterized by including a battery module according to the present invention.

[0028] And, the present invention provides an automobile characterized by including a battery module according to the present invention.

[0029] According to one aspect of the present invention, when thermal runaway occurs in a battery module, the thermal energy received by adjacent battery modules can be minimized. This prevents or suppresses the propagation of thermal runaway between battery modules, thereby ensuring the safety and reliability of the battery pack.

[0030] In addition, according to another aspect of the present invention, high-temperature gas or flames, etc. can be quickly discharged to the outside of the battery pack, so that heat accumulation inside the battery pack can be eliminated.

[0031] In addition, according to another aspect of the present invention, when thermal runaway occurs in a battery module, it is possible to prevent high-temperature gas or flames discharged outside the battery module from flowing back into the interior of another battery module.

[0032] In addition, according to another aspect of the present invention, events resulting from thermal runaway of a battery pack or a device equipped with a battery pack, such as fire or explosion, can be prevented or delayed.

[0033] In addition, the present invention may have various other effects, which will be described in each embodiment configuration, or an explanation of effects that can be easily inferred by a person skilled in the art will be omitted.

[0034] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0035] FIG. 1 is a perspective view of a battery pack according to one embodiment of the present invention.

[0036] FIG. 2 is a perspective view showing the inside of a battery pack according to one embodiment of the present invention.

[0037] Figure 3 is an exploded perspective view of a battery pack according to one embodiment of the present invention.

[0038] Fig. 4 is a cross-sectional view of a battery pack according to one embodiment of the present invention. For example, Fig. 4 may be a drawing illustrating cross-section I-I' of Fig. 2.

[0039] FIG. 5 is a top view of a battery pack with a stopper applied according to one embodiment of the present invention.

[0040] FIG. 6 is a top view of a battery pack with a stopper applied according to another embodiment of the present invention.

[0041] FIG. 7 is a drawing for explaining a module cover that is partially opened during thermal runaway in a battery pack according to one embodiment of the present invention.

[0042] FIG. 8 is a perspective view showing the inside of a battery pack to which a guide member according to one embodiment of the present invention is applied.

[0043] FIG. 9 is a cross-sectional view of a battery pack to which a guide member according to one embodiment of the present invention is applied.

[0044] FIG. 10 is a top view of a battery pack to which a guide member according to one embodiment of the present invention is applied.

[0045] FIG. 11 is a top view of a battery pack to which a guide member is applied according to another embodiment of the present invention.

[0046] FIG. 12 is a top view of a battery pack to which a guide member is applied according to another embodiment of the present invention.

[0047] FIG. 13 is a rear perspective view of a battery module included in a battery pack according to another embodiment of the present invention.

[0048] FIG. 14 is a cross-sectional view of a battery pack according to another embodiment of the present invention.

[0049] FIG. 15 is a perspective view showing a module cover included in a battery pack according to another embodiment of the present invention.

[0050] FIG. 16 is a top view of a battery pack with a stopper applied according to another embodiment of the present invention.

[0051] FIG. 17 is a top view of a battery pack to which a guide member is applied according to another embodiment of the present invention.

[0052] FIG. 18 is a top view of a battery pack to which a guide member is applied according to another embodiment of the present invention.

[0053] FIG. 19 is a schematic perspective view of a vehicle including a battery pack according to one embodiment of the present invention.

[0054] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0055] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0056] Furthermore, the present invention includes various embodiments. For each embodiment, redundant descriptions of substantially identical or similar components will be omitted, and the differences will be described.

[0057] Meanwhile, in the present invention, terms indicating directions such as up, down, left, right, front, and back may be used, but it is obvious to those skilled in the art that these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0058] For example, in an embodiment of the present invention, the X-axis direction shown in the drawing may mean a left-right direction, the Y-axis direction may mean a front-back direction perpendicular to the X-axis direction on a horizontal plane (XY plane), and the Z-axis direction may mean an up-down direction (vertical direction) perpendicular to both the X-axis direction and the Y-axis direction.

[0059]

[0060] FIG. 1 is a perspective view of a battery pack according to an embodiment of the present invention, FIG. 2 is a perspective view showing the inside of a battery pack according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of a battery pack according to an embodiment of the present invention. In addition, FIG. 4 is a cross-sectional view of a battery pack according to an embodiment of the present invention. For example, FIG. 4 may be a drawing showing a cross-section taken along line I-I' of FIG. 2.

[0061] Referring to FIGS. 1 to 4, a battery pack (1) according to one embodiment of the present invention includes a battery cell (100), a pack case (200), and a blocking member (300).

[0062] First, referring to FIG. 3, a plurality of battery cells (100) may be included. In addition, although not shown in the drawing, the plurality of battery cells (100) may include an electrode assembly, a cell case that accommodates the electrode assembly, and an electrode lead that is connected to the electrode assembly and extends outward from the cell case to function as an electrode terminal. In this case, the plurality of battery cells (100) may be electrically connected to each other.

[0063] The battery cell (100) may be a pouch-type secondary battery. The cell case of such a pouch-type secondary battery may be configured in a pouch shape in which a metal layer made of aluminum is interposed between polymer layers.

[0064] A plurality of battery cells (100) can be arranged in a vertical direction (Z-axis direction) and in a front-back direction (X-axis direction) as shown in FIG. 3.

[0065] Meanwhile, the present invention is not limited by the specific type or shape of the battery cell (100), and various battery cells (100) known at the time of filing of the present invention may be employed to construct the battery pack (1) of the present invention. In this embodiment, a pouch-type secondary battery having a high energy density and easy stacking is targeted as shown in the drawing, but it is of course possible for a cylindrical or square secondary battery to be applied as the battery cell (100).

[0066] The pack case (200) may be configured to accommodate a plurality of battery cells (100). The pack case (200) may be formed with a receiving space configured to accommodate a plurality of battery cells (100). The receiving space may be an empty space and may be provided in a shape capable of accommodating battery cells (100) therein.

[0067] The pack case (200) may be made of a material that can ensure mechanical strength, such as metal or plastic, such as steel or SUS, or may include such a material, in order to safely protect the battery cells (100) contained therein.

[0068] Meanwhile, referring to FIGS. 2 to 4, a battery pack (1) according to an embodiment of the present invention may include a blocking member (300). The blocking member (300) may be configured to separate the receiving space of the battery module (10) from the external space of the pack case (200). That is, the blocking member (300) may be configured so that the exhaust generated from the battery module (10) flows only from the outside of the battery module (10). Here, the exhaust may mean all substances discharged when a thermal event occurs in the battery module (10), such as venting gas, flame, or spark.

[0069] Specifically, the blocking member (300) may include a module cover (310). The module cover (310) may be configured to cover the outside of the battery cell (100).

[0070] In particular, the module cover (310) may be configured to completely separate the receiving space of the battery cell (100) from the external space of the pack case (200). That is, the module cover (310) may be configured so that the exhaust generated from the battery cell (100) flows only on the outside of the module cover (310).

[0071] Such module covers (310) may be made of materials with excellent heat resistance and / or fire resistance, such as mica.

[0072] Accordingly, the blocking member (300) can be configured to guide the discharged matter from the battery cell (100) to the external space of the module cover (310).

[0073] According to the above-described embodiment of the present invention, even if a thermal event occurs due to the blocking member (300), the battery cell (100) and the space through which the exhaust flows are separated, so that thermal damage directly suffered by the battery cell (100) can be minimized.

[0074] In addition, it is possible to prevent the exhaust gas discharged to the outer space of the module cover (310) from flowing back into other battery cells (100). This minimizes heat transfer to other battery cells (100), thereby ensuring the safety and reliability of the battery pack (1).

[0075]

[0076] Meanwhile, referring to FIG. 3, a plurality of battery cells (100) may be modularized into one or more battery modules (10). That is, a battery pack (1) according to the present invention may include one or more battery modules (10). In addition, a plurality of battery cells (100) may be included as components of one or more battery modules (10). In this case, multiple battery cells (100) included within a battery module (10) may be electrically connected to each other.

[0077] Moreover, a plurality of battery modules (10) may be provided inside the pack case (200). That is, the battery pack according to the present invention (1) includes a plurality of battery modules (10), and a plurality of battery cells (100) included in the battery pack (1) may be divided and included in a plurality of battery modules (10).

[0078] A plurality of battery modules (10) may be arranged along at least one direction within the pack case (200). For example, as in the embodiment illustrated in FIG. 3, a plurality of battery modules (10) may be arranged in four rows along the front-back direction of the pack case (200) and in two columns along the left-right direction of the pack case (200), so that a total of eight battery modules (10) may be provided.

[0079] In particular, the battery pack (1) according to the present invention may include a module case (11). The module case (11) may be configured to have an empty space formed therein so as to accommodate at least some of a plurality of battery cells (100) in the internal space. In particular, the module case (11) may be included in each battery module (10), grouping a plurality of battery cells (100) into several battery modules (10), and may serve as a boundary that physically limits the internal space of each battery module (10).

[0080] Additionally, although not shown in the drawing, the battery module (10) may include a busbar assembly and / or module terminals electrically connected to a plurality of battery cells (100) housed therein.

[0081] A venting hole (12) may be formed in the module case (11). The venting hole (12) may be configured to allow venting gas generated from a battery cell (100) housed inside the module case (11) to be discharged to the outside of the module case (11).

[0082] Specifically, the venting hole (12) can enable directional venting in a specific direction. For example, as illustrated in FIG. 3, a venting hole (12) is formed on the upper surface of the module case (11), and directional venting toward the top of the battery module (10) can be enabled through the venting hole (12). A plurality of venting holes (12) can be provided, and can be provided at regular intervals in the horizontal direction (X-axis, Y-axis direction).

[0083] According to the above-described embodiment of the present invention, in a situation where one of the battery cells (100) undergoes thermal runaway and gas or the like is generated, the gas or the like can be quickly directional vented in a specific direction from the module case (11).

[0084] Additionally, although not shown in the drawing, the battery module (10) may include a busbar assembly and / or module terminals electrically connected to a plurality of battery cells (100) housed therein.

[0085] In this way, the venting hole (12) provided on the upper surface of the module case (11) can be configured to discharge gas or flame generated inside the battery module (10) to the outside of the battery module (10) when thermal runaway of the battery module (10) occurs. The remaining portion of the module case (11) excluding the venting hole (12) is sealed, and the gas or flame can be discharged in a straight line toward the venting hole (12).

[0086] According to the above-described embodiment of the present invention, even if a thermal event occurs at any location of the battery cell (100), the gas or flame generated in the battery cell (100) is discharged to the outside of the battery module (10) through specific venting holes (12) provided at the upper portion of the battery cell (100), thereby facilitating venting.

[0087] At this time, the module cover (310) may be configured to cover one side of the module case (11). In particular, the module cover (310) may be configured to cover the outer side of the module case (11) where the venting hole (12) is formed. For example, as in the embodiment illustrated in FIG. 3, when the venting hole (12) is formed at the upper part of the module case (11), the module cover (310) may be placed at the upper part of the module case (11).

[0088] According to the above-described embodiment of the present invention, the discharged matter discharged from the venting hole (12) of the battery module (10) can flow in the external space of the module cover (310).

[0089]

[0090] The module cover (310) may be configured to cover the upper portion of at least a portion of the plurality of module cases (11). For example, the module cover (310) may be configured to cover the upper portion of each of the module cases (11). Alternatively, the module cover (310) may be configured to cover the entirety of the module cases (11) arranged in one direction. As in the embodiment illustrated in FIG. 2, the module cover (310) may be configured to cover the upper portions of all of the module cases (11) arranged in the front-back direction. That is, the module cover (310) may be configured in a long form so as to cover from one end to the other end of a stack of battery modules (10) arranged in one direction.

[0091] According to the above-described embodiment of the present invention, the module cover (310) can guide the discharged matter from the outer space of the module cover (310) to the outer side of the stack of battery modules (10). In addition, according to the above-described embodiment of the present invention, since the module cover (310) is provided to extend long along the direction in which the battery module (10) is arranged, the module cover (310) can reliably separate the inner space and the outer space of the pack case (200) in which the battery module (10) is accommodated. As a result, it is possible to prevent the discharged matter discharged to the outer side of the module cover (310) from affecting the battery module (10).

[0092]

[0093] Meanwhile, referring to FIG. 4, the module cover (310) may be positioned at a predetermined distance from the module case (11). For example, the module cover (310) may be configured to cover the upper surface of the module case (11) from the outside and may be positioned at a predetermined distance from the upper surface of the module case (11).

[0094] Specifically, the pack case (200) may be provided with a cross beam (230) configured to partition between battery modules (10) arranged in one direction inside the pack case (200). The cross beam (230) may be provided to protrude upward from the module case (11). In addition, the module cover (310) may be configured to be seated on the cross beam (230). As a result, the module cover (310) and the module case (11) may be provided to be spaced apart from each other by a predetermined distance.

[0095] According to the above-described embodiment of the present invention, since the module cover (310) is spaced apart from the module case (11) by a predetermined distance, the module cover (310) can more reliably separate the receiving space of the battery module (10) from the external space. Accordingly, even if venting gas or flames are emitted from a battery module (10), heat can be suppressed from spreading to other adjacent battery modules (10). In addition, according to the above-described embodiment of the present invention, since the module cover (310) is secured and coupled to the cross beam (230), the assembling property of the battery pack (1) can be improved.

[0096]

[0097] FIG. 5 is a top view of a battery pack to which a stopper is applied according to one embodiment of the present invention, and FIG. 6 is a top view of a battery pack to which a stopper is applied according to another embodiment of the present invention.

[0098] The blocking member (300) may include a stopper (320). The stopper (320) may be interposed between the module case (11) and the module cover (310). A plurality of stoppers (320) may be provided, and each may be provided for each battery module (10).

[0099] The stopper (320) may be configured to limit the distance between the module case (11) and the module cover (310). When a thermal event occurs inside the battery module (10), the upper portion of the battery module (10) may expand as the pressure inside the battery module (10) increases. In this case, the space between the upper surface of the module case (11) and the battery cell (100) may become uneven, and thus directional venting through the venting hole (12) may not be performed smoothly.

[0100] However, according to the above embodiment of the present invention, since a stopper (320) is provided between the module case (11) and the module cover (310), the stopper (320) can pressurize and fix the battery module (10) at the upper portion of the module case (11). As a result, since the module case (11) can be prevented from expanding upward, the exhaust inside the battery module (10) can be smoothly directionally vented to the outside through the venting hole (12).

[0101] Specifically, the stopper (320) may be provided so as to be mounted on the upper portion of the module case (11). In addition, the module cover (310) may be configured to be mounted on the stopper (320). That is, the height of the stopper (320) may be provided to be approximately the distance between the module cover (310) and the module case (11).

[0102] According to the above-described embodiment of the present invention, since the stopper (320) structurally supports the module cover (310), the module cover (310) can be prevented from being sagged by gravity. In addition, the module case (11) can be more reliably prevented from being lifted.

[0103]

[0104] Meanwhile, the stopper (320) may be configured to prevent emissions such as flames discharged through the venting hole (12) inside the battery module (10) from flowing back into the battery module (10) through another adjacent venting hole (12). The stopper (320) may be configured with a material having fire-resistant and / or heat-resistant properties. For example, the stopper (320) may be made of a material such as silicone, polyurethane, or mica.

[0105] Specifically, the stopper (320) can be placed between the venting holes (12). As described above, the venting holes (12) can be provided in multiple numbers, and can be provided at regular intervals between each other in the horizontal direction (X-axis, Y-axis direction).

[0106] As in the embodiment illustrated in Fig. 5, the stopper (320) may be provided between venting holes (12) spaced apart from each other along the X-axis direction.

[0107] Meanwhile, referring to FIG. 5, a plurality of venting holes (12) can form a venting hole array arranged along one direction. The venting hole array can be formed by arranging the venting holes (12) in a row along the longitudinal direction of the battery cell (100) (Y-axis direction in FIG. 5).

[0108] According to the above-described embodiment of the present invention, even if a thermal event occurs at any location of the battery cell (100), gas or flame generated in the battery cell (100) can be discharged to the outside of the battery module (10) through the venting hole (12) included in the venting hole array provided on the upper portion of the battery cell (100).

[0109] In addition, a plurality of venting hole arrays may be provided, and the plurality of venting hole arrays may be arranged in parallel along one direction, that is, the direction in which the battery cells (100) are stacked (the X-axis direction in FIG. 5). One venting hole array may be provided to correspond to at least one battery cell (100).

[0110] At this time, as in the embodiment illustrated in FIG. 6, the stopper (320) may be provided between the venting hole arrays. That is, the stopper (320) may be provided between the venting holes (12) spaced apart from each other along a direction orthogonal to the horizontal direction and the direction in which the battery cells (100) are stacked. According to the above-described embodiment of the present invention, since the movement of exhaust gases between the battery cells (100) can be blocked, heat transmission between the battery cells (100) can be suppressed or delayed.

[0111] Furthermore, referring to FIGS. 5 and 6, the stopper (320) may be configured to be elongated in at least one direction. That is, the stopper (320) may be configured to be elongated in at least one direction between the venting holes (12). For example, the stopper (320) may be configured to be elongated in the stacking direction of the battery cells (100) or in a direction perpendicular to the stacking direction of the battery cells (100).

[0112] According to the above-described embodiment of the present invention, since the stopper (320) is configured to cross a plurality of venting holes (12), the movement of discharged substances can be more reliably blocked. In addition, since the process is simplified compared to when multiple stoppers (320) are provided for one battery module (10), productivity can be improved when manufacturing a battery pack (1).

[0113]

[0114] FIG. 7 is a drawing for explaining a module cover that is partially opened during thermal runaway in a battery pack according to one embodiment of the present invention.

[0115] Referring to FIG. 7, the module cover (310) may include an opening (311). The opening (311) may be configured to be opened by the pressure or heat of the exhaust discharged from the battery cell (100). The opening (311) may be provided at the upper portion of the venting hole (12).

[0116] Specifically, in a normal state, the module cover (310) can protect the battery module (10) and the battery cell (100) by covering the outer surface of the module case (11) where the venting hole (12) is formed. However, if a thermal event occurs in which venting gas or flames are generated in some of the battery cells (100), the opening (311) of the module cover (310) is opened so that the exhaust can smoothly be discharged into the outer space of the module cover (310) without being obstructed in its path through the venting hole (12) of the battery module (10).

[0117] According to the above-described embodiment of the present invention, as the opening (311) is opened and the venting hole (12) is exposed to the outside of the module cover (310), exhaust gases such as gas or flames can be completely discharged to the outside of the battery module (10).

[0118] In addition, according to the above-described embodiment of the present invention, the module cover (310) can prevent exhaust gases, such as gases or flames, discharged to the outside from flowing back into the interior of an adjacent battery module (10). Accordingly, by minimizing heat transmission to neighboring battery modules (10), thermal runaway transmission can be effectively prevented or delayed, thereby ensuring the safety and reliability of the battery module (10).

[0119] Specifically, the opening (311) may include a cover hole (311a) formed in the main body of the module cover (310) and an opening member (311b) that is openable and closable in the cover hole (311a).

[0120] The opening member (311b) may be configured to be detachable or openable from the module cover (310) by exhaust gases discharged from the battery cell (100). As a result, the cover hole (311a) is opened, so that exhaust gases discharged from the venting hole (12) can be discharged to the outside of the module cover (310) through the cover hole (311a).

[0121] For example, the opening portion (311) may be formed with a notch along the outer periphery of the cover hole (311a). In this case, the opening member (311b) may be completely separated from the module cover (310) body, thereby opening the cover hole (311a). Alternatively, the opening member (311b) may be configured to be broken by being provided with a slit or notch. In this case, only a portion of the cover hole (311a) may be opened.

[0122] Meanwhile, the opening (311) may be configured to face at least partially the venting hole (12). That is, the opening (311) may be configured to face at least some of the plurality of venting holes (12). In particular, the opening (311) may be arranged to individually correspond to each venting hole (12).

[0123] According to the above-described embodiment of the present invention, the discharge pressure of the discharged material that is discharged in a straight line through the venting hole (12) acts on the opening portion (311), thereby directly pushing the opening portion (311) in the discharge direction of the discharged material, thereby opening the cover hole (311a). Accordingly, when the discharged material is discharged from a certain venting hole (12), only the cover hole (311a) of the opening portion (311) that is provided to face the upper portion of the venting hole (12) can be configured to be opened. Accordingly, the discharged material can be discharged more quickly into the outer space of the module cover (310) through the cover hole (311a).

[0124]

[0125] Fig. 8 is a perspective view showing the inside of a battery pack to which a guide member is applied according to one embodiment of the present invention, Fig. 9 is a cross-sectional view of a battery pack to which a guide member is applied according to one embodiment of the present invention, and Fig. 10 is a view of a battery pack to which a guide member is applied according to one embodiment of the present invention, viewed from above. In addition, Fig. 11 is a view of a battery pack to which a guide member is applied according to another embodiment of the present invention, viewed from above.

[0126] Referring to FIGS. 8 to 11, the blocking member (300) may include a guide member (330). The guide member (330) may be positioned on the outside of the module cover (310). That is, the guide member (330) may be provided between the upper surface of the pack case (200) and the module cover (310).

[0127] The guide member (330) may be configured to guide the discharge flowing through the outer space of the module cover (310). The guide member (330) may be composed of a material having fire-resistant and / or heat-resistant properties. For example, the guide member (330) may be made of a material such as silicone, polyurethane, or mica.

[0128] The guide member (330) may be configured to be elongated along at least one direction. For example, as in the embodiment illustrated in FIG. 6, the guide member (330) may be configured to be elongated along the stacking direction of the plurality of battery modules (10). That is, the guide member (330) may be configured to be elongated along the front-rear direction of the battery pack (1).

[0129] In particular, the guide member (330) may be configured to be extended from one end of the stack of battery modules (10) to the other end. That is, the guide member (330) may be configured to overlap at least a portion of the plurality of battery modules (10). At this time, one end of the guide member (330) may be provided on the outside of the stack of battery modules (10). According to the above-described embodiment of the present invention, the guide member (330) can simultaneously guide the flow of exhaust material flowing from the upper portion of the plurality of battery modules (10).

[0130] A plurality of guide members (330) may be provided. The plurality of guide members (330) may be arranged to be spaced apart from each other by a predetermined distance in the horizontal direction. At this time, a venting path (P) configured to allow the discharge to flow may be formed between adjacent guide members (330). That is, the venting path (P) may be formed in the outer space of the module cover (310). The venting path (P) may be formed between the pack case (200), the guide member (330), and the module cover (310). The venting path (P) may be configured to be long and extend in the front-back direction, such as the direction in which the guide member (330) extends. At this time, the guide member (330) may be configured to block the discharge from moving to another venting path (P).

[0131] In this way, the guide member (330) can guide the exhaust flowing through the venting urea (P) in at least one direction in the outer space of the module cover (310) to smoothly discharge it to the outside of the pack case (200).

[0132]

[0133] Meanwhile, referring to FIG. 8, a pack case (200) according to one embodiment of the present invention may include a base frame (210) and a side frame (220).

[0134] The base frame (210) may form the lower surface of the pack case (200) and may be provided in a square plate shape. In addition, the base frame (210) may be configured such that a plurality of battery cells (100) are mounted on the upper surface. Furthermore, the base frame (210) may be provided with a flat upper surface so that a plurality of battery modules (10) are stably mounted thereon.

[0135] The side frame (220) may extend upward from each corner of the base frame (210). The side frame (220) may be provided with a plurality of unit walls to surround a plurality of battery cells (100) or battery modules (10). More specifically, the plurality of side frames (220) may be provided with a right wall located at the -Y direction side end of the base frame (210), a rear wall located at the +X direction side end, a left wall located at the +Y direction side end, and a front wall located at the -X direction side end, respectively, to form a side surface of the pack case (200).

[0136] The pack lid (250) may be configured to cover the upper portion of a plurality of battery modules (10). The pack lid (250) may be configured to cover the open upper portion of the pack case (200). The pack lid (250) may be coupled to the side frame (220). The pack lid (250) may protect components housed inside the pack case (200), such as the battery module (10), and may prevent exhaust gases discharged from the battery module (10) from being discharged to the outside of the pack case (200), particularly to the upper portion.

[0137] In addition, the pack case (200) may be provided with a venting portion (260). The venting portion (260) may be configured to discharge exhaust generated from the battery module (10) to the outside of the pack case (200). The venting portion (260) may be provided in the form of a hole penetrating between the inside and the outside of the pack case (200). Alternatively, the venting portion (260) may be configured to be mountable in the hole of the pack case (200) and may be provided in the form of a venting device that is activated when exhaust is generated inside the pack case (200).

[0138] The venting portion (260) may be provided on the side of the pack case (200), i.e., the side frame (220). A plurality of venting portions (260) may be provided. The venting portions (260) may be located on at least some of the unit walls among the multiple unit walls of the side frame (220). In addition, the venting portions (260) may be separately formed on two or more unit walls, or two or more may be formed on one unit wall. For example, referring to FIG. 8, a plurality of venting portions (260) may be provided on each of the front wall and the rear wall. In addition, the plurality of venting portions (260) may be provided to be symmetrical to each other with respect to the central axis of the side frame (220).

[0139] According to the above-described embodiment of the present invention, when the battery cell (100) is in an abnormal state, high-temperature gas or the like can be discharged in both directions of the pack case (200), so it is easy to discharge the gas more quickly to the outside of the pack case (200).

[0140] Meanwhile, the number and location of the venting portion (260) described based on the embodiment of Fig. 8 are merely examples, and can be changed to various other numbers and locations.

[0141] Meanwhile, the pack case (200) may further include a center beam (240) and a cross beam (230). The center beam (240) and the cross beam (230) may be provided to partition between a plurality of battery modules (10). For example, the center beam (240) may be formed in the form of a partition wall that extends long in the front-back direction, and may be interposed between battery modules (10) that are adjacently arranged in the left-right direction. In addition, the cross beam (230) may be formed in the form of a partition wall that extends long in the left-right direction, and may be interposed between battery modules (10) that are adjacently arranged in the front-back direction.

[0142] According to this implementation configuration, heat or flame can be prevented from being directly directed between battery modules (10) whose storage space is separated by a center beam (240) and a cross beam (230).

[0143] Meanwhile, a plurality of guide members (330) may be provided symmetrically around the center beam (240). A plurality of guide members (330) may be provided between the center beam (240) and the side frames (220). For example, as in the embodiment illustrated in FIG. 8, three guide members (330) may be provided between the center beam (240) and each of the side frames (220).

[0144] The guide member (330) may be configured to guide the discharged material to the venting portion (260). For example, the guide member (330) may be provided to extend long toward the venting portion (260). Accordingly, the discharged material, such as a venting gas, moving through the venting path (P) between the guide members (330) may be directed toward the venting portion (260). At this time, according to one embodiment of the present invention, as in the embodiment illustrated in FIG. 10, a plurality of guide members (330) may be provided in parallel to each other so that the spacing between the guide members (330) may be maintained constant.

[0145] According to the above-described embodiment of the present invention, when a thermal event occurs in the battery module (10), the guide member (330) guides the exhaust inside the venting path (P) toward the venting portion (260), thereby allowing the exhaust to be quickly discharged to the outside of the pack case (200). This prevents the internal pressure inside the pack case (200) from increasing and prevents additional chain fires in other battery modules (10).

[0146]

[0147] In addition, as another embodiment of the present invention, referring to FIG. 11, the guide member (330) may be configured such that the area of ​​the venting path (P) becomes smaller as at least a portion of the venting path (P) gets closer to the venting portion (260). Specifically, the guide member (330) may include a portion configured such that the gap between the venting paths (P) becomes narrower as it gets closer to the venting portion (260).

[0148] According to the above-described embodiment of the present invention, the guide member (330) can better guide the exhaust within the venting path (P) toward the direction in which the venting portion (260) is located. Accordingly, the exhaust can be smoothly discharged to the outside of the battery pack (1) through the venting portion (260), thereby suppressing or preventing thermal runaway between battery modules (10).

[0149]

[0150] Meanwhile, referring to FIG. 8, the guide member (330) can be coupled and fixed to the cross beam (230). Specifically, the module cover (310) is secured to the cross beam (230), and the guide member (330) is secured to the module cover (310), so that the guide member (330), the module cover, and the cross beam (230) can be coupled and fixed to each other by a coupling member such as a bolt at the upper portion of the guide member (330).

[0151] According to the above-described embodiment of the present invention, a fixed and coupled configuration between the blocking member (300) and the pack case (200) can be achieved with a simple structure. Furthermore, according to the above-described embodiment of the present invention, since the module cover (310) is manufactured in a form in which it is pre-seated on the cross beam (230), when the guide member (330) is coupled to the upper portion of the cross beam (230), the blocking member (300) can be automatically coupled to the cross beam (230). Therefore, time and cost in manufacturing the battery pack (1) can be reduced, thereby improving productivity. In addition, since the blocking member (300) can be stably fixed between the cross beam (230) and the pack lead (250), the rigidity of the battery pack (1) can be further secured.

[0152]

[0153] FIG. 12 is a top view of a battery pack to which a guide member is applied according to another embodiment of the present invention.

[0154] As another embodiment, referring to FIG. 12, a plurality of guide members (330) may be provided and arranged to be spaced apart from each other by a predetermined distance in the longitudinal direction. That is, the guide members (330) may be configured in a discontinuous shape rather than a shape that extends continuously from one end to the other. In particular, a plurality of guide members (330) provided on the outer side of the opening (311) may be provided and arranged to be spaced apart from each other by a predetermined distance in the longitudinal direction.

[0155] Accordingly, heat can be dispersed into the space between adjacent guide members (330) arranged in the longitudinal direction. In addition, the guide members (330) provided between the openings (311) are configured in a continuously extended form, so that the venting path (P) can be separated into two sides.

[0156] According to the above-described embodiment of the present invention, the exhaust inside the venting path (P) can be guided toward the venting section (260) by the guide member (330), while simultaneously dispersing the heat inside the venting path (P). As a result, heat accumulation between the module cover (310) and the pack lid (250) can be minimized.

[0157]

[0158] Fig. 13 is a rear perspective view of a battery module included in a battery pack according to another embodiment of the present invention. In addition, Fig. 14 is a cross-sectional view of a battery pack according to another embodiment of the present invention. In addition, Fig. 15 is a perspective view showing a module cover included in a battery pack according to another embodiment of the present invention, and Fig. 16 is a top view of a battery pack with a stopper applied according to another embodiment of the present invention.

[0159] Referring to Fig. 13, the venting hole (12) of the battery module (10) may be formed on the rear side. The rear side of the battery module (10) may mean the opposite side of the module terminal of the battery module (10). In addition, in this case, a plurality of battery modules (10) may be arranged inside the pack case (200) such that the module terminals face the inside of the pack case (200). The venting hole (12) may be arranged so as to face the outside of the pack case (200).

[0160] For example, referring to the bold arrow illustrated in FIG. 14, when a thermal event occurs in a battery module (10), venting gas or flames, etc., can be discharged through the venting hole (12) provided on the rear side of the battery module (10). Accordingly, when a thermal event occurs in the battery module (10), venting gas or flames, etc., can be suppressed from moving toward the module terminal side of the battery module (10). In addition, thermal damage to other battery modules (10) can be minimized as much as possible.

[0161] In this case, referring to FIGS. 14 and 15, the outer portion of the module cover (310) may be configured to be at least partially open. A portion of the module cover (310) may be configured to be open so that the exhaust discharged from the venting hole (12) provided on the rear side of the battery module (10) can move to the outer side of the module cover (310). For example, the left and right corners of the module cover (310) may be configured to be spaced apart from the left and right side frames (220) by a predetermined distance. Accordingly, the exhaust can move from the rear side of the battery module (10) to the outer side of the module cover (310).

[0162] Alternatively, as in the embodiment illustrated in Fig. 15, the opening (311) of the module cover (310) may be provided on the side where the venting hole (12) of the battery module (10) is provided. For example, the opening (311) may be positioned along the outer edge of the module cover (310).

[0163] According to the above-described embodiment of the present invention, since the opening (311) is provided on the side where the venting hole (12) is located, exhaust gases such as gas or flames can be quickly discharged to the outside of the module cover (310).

[0164] In addition, referring to FIG. 16, the stopper (320) may be configured to guide the discharged matter from the battery module (10) directly to the outside of the module cover (310). For example, as in the embodiment illustrated in FIG. 16, the stopper (320) may be provided on the rear side of the battery module (10). In addition, the stopper (320) may be configured to suppress the discharged matter from moving beyond the stopper (320) to the inside of the battery module (10).

[0165] According to the above-described embodiment of the present invention, the discharged matter discharged through the venting hole (12) by the stopper (320) can be directed directly to the outside of the module cover (310). In addition, the discharged matter can be prevented from being directed toward the module terminal by the stopper (320).

[0166]

[0167] FIG. 17 and FIG. 18 are views of a battery pack with a guide member applied according to another embodiment of the present invention, each viewed from above.

[0168] Furthermore, when a venting hole (12) is provided on the rear side of the battery module (10), the guide member (330) may be provided on the inner side of the opening (311), as in the embodiments illustrated in FIGS. 17 and 18. In addition, a plurality of guide members (330) may be provided and arranged to be spaced apart from each other by a predetermined distance in the longitudinal direction. That is, the guide member (330) may be configured in a discontinuous form rather than a form that extends continuously from one end to the other.

[0169] Accordingly, when a thermal event occurs in the battery module (10), the exhaust discharged from the open opening (311) can pass through the space between adjacent guide members (330) arranged in the longitudinal direction and move to the venting path (P).

[0170] According to the above-described embodiment of the present invention, the discharged matter moved to the outside of the module cover (310) by the guide member (330) can move into the venting path (P). In addition, since such discharged matter can be guided toward the venting part (260), the discharged matter can be quickly discharged to the outside of the pack case (200).

[0171] Additionally, the guide member (330) may be provided on the inner side of the module cover (310) in a continuously extended form. This further suppresses the movement of exhaust beyond the center beam (240) toward other battery modules (10).

[0172] According to the above-described embodiment of the present invention, when thermal runaway occurs in a battery module (10), the thermal energy received by adjacent battery modules (10) can be minimized. As a result, the propagation of thermal runaway between battery modules (10) can be prevented or suppressed, thereby ensuring the safety and reliability of the battery pack (1).

[0173]

[0174] FIG. 19 is a schematic perspective view of a vehicle including a battery pack according to one embodiment of the present invention.

[0175] Referring to FIG. 19, a vehicle (3) according to one embodiment of the present invention may include one or more battery packs (1) according to one embodiment of the present invention. The vehicle (3) according to the present invention may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The vehicle (3) includes a four-wheel vehicle and a two-wheel vehicle. The vehicle (3) may operate by receiving power from a battery pack (1) according to one embodiment of the present invention.

[0176]

[0177] Although the present invention has been described above with reference to 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 idea of ​​the present invention and the equivalent scope of the claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

Claims

1. Multiple battery cells; A pack case configured to accommodate the plurality of battery cells; and A battery pack characterized by comprising a module cover configured to cover the outer side of the battery cell, and including a blocking member configured to guide exhaust gas discharged from the battery cell to the outer space of the module cover.

2. In paragraph 1, A module case further comprises a module case that accommodates the above plurality of battery cells by grouping them and has at least one venting hole formed on one side thereof, A battery pack, characterized in that the module cover is configured to cover one side of the module case where the venting hole is formed.

3. In paragraph 2, The above module cases are provided in multiple units, A battery pack, characterized in that the module cover is configured to cover at least a portion of a plurality of module cases.

4. In paragraph 2, A battery pack, characterized in that the module cover is positioned at a predetermined distance from the module case.

5. In paragraph 2, The above blocking absence A battery pack characterized by including a stopper interposed between the module case and the module cover.

6. In paragraph 5, A battery pack, characterized in that the stopper is configured to limit a distance between the module case and the module cover.

7. In paragraph 5, A battery pack, characterized in that the module cover is configured to be seated on the stopper.

8. In paragraph 5, A battery pack, characterized in that the stopper is positioned between the venting holes.

9. In paragraph 5, A battery pack, characterized in that the stopper is configured to be elongated in at least one direction.

10. In paragraph 1, A battery pack characterized in that the module cover includes an opening configured to open by pressure or heat to discharge the exhaust to the outside.

11. In paragraph 1, The above blocking absence A battery pack characterized by including a guide member disposed on the outside of the module cover in a form that extends lengthwise along at least one direction.

12. In paragraph 11, The above guide member is provided in multiple pieces spaced apart from each other in the horizontal direction, A battery pack characterized in that a venting path is formed between the guide members to allow the discharge to flow.

13. In paragraph 12, The above pack case is Including a venting part configured to discharge the above-mentioned discharge to the outside of the pack case, A battery pack, characterized in that the guide member is configured to guide the discharge to the venting portion.

14. In paragraph 13, A battery pack characterized in that the guide member is configured such that the venting path area becomes smaller as at least a portion of the venting path gets closer to the venting portion.

15. In paragraph 11, A battery pack characterized in that the above guide members are provided in multiple numbers and arranged so as to be spaced apart from each other by a predetermined distance in the longitudinal direction.

16. A vehicle comprising a battery pack according to any one of claims 1 to 15.

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