Battery pack and vehicle including same

Abstract

The present invention relates to a battery module comprising: a plurality of battery cells; a pack case accommodating the plurality of battery cells; and a shield member attached to the pack case, extending in at least one direction.

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. 10-2024-0114408, filed on August 26, 2024, and all contents disclosed in the specification and drawings of the said application are incorporated herein by reference.

[0003] 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.

[0004] 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.

[0005] When connecting multiple battery cells in series or parallel to form a battery pack, it's common 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. Recently, battery packs in the cell-to-pack form, where multiple battery cells are housed directly in a pack housing or other device, without modularization, have also been manufactured.

[0006] Meanwhile, since battery cells undergo chemical reactions during charging and discharging, their performance can deteriorate if used in environments above optimal temperatures. Furthermore, if thermal control fails to maintain optimal temperatures, there's a constant risk of unexpected fire or explosion. Furthermore, battery modules are structured to house these cells tightly within the module case. Therefore, if a thermal event occurs in a single battery cell, the resulting high-temperature gases and flames can spread to adjacent cells, potentially triggering a chain reaction of battery cell explosions, posing a significant risk.

[0007] Conventionally, high-temperature gases and flames are discharged through venting holes located on the top of the module case and then vented outside the pack case through the space between the pack case and the battery module. However, there has been a problem in which high-temperature gases and flames discharged through the venting holes migrate to other battery cells, accelerating thermal runaway between battery cells.

[0008] In addition, as the shape of the module case is deformed by heat such as high-temperature gas or flame, the gap between the pack case and the battery module is not maintained, making it difficult to secure a path for high-temperature gas or flame to be discharged outside the pack case.

[0009] Therefore, there is a need to develop a structure that can effectively prevent or delay thermal runaway by suppressing the movement of venting gases or flames to other battery cells.

[0010] In addition, when thermal runaway of a battery cell occurs, there is a need to develop a structure that can maintain a gap between the pack case and the battery module to secure a path for the high-temperature gas or flame generated inside the battery module to be discharged.

[0011] Accordingly, the problem to be solved by the present invention is to provide a battery pack and a vehicle including the same that can effectively prevent or delay thermal runaway by suppressing the movement of venting gas or flames to other battery cells.

[0012] 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.

[0013] 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 blocking member coupled to the pack case and configured to extend in at least one direction.

[0014] The device may further include a module case configured to accommodate the plurality of battery cells by grouping them, and the blocking member may be configured to maintain a gap between the pack case and the module case.

[0015] The above module case may have a plurality of venting holes formed on one side thereof to discharge venting gas generated from the battery cell to the outside, and the blocking member may be provided between adjacent venting holes.

[0016] The module case may further include a module cover configured to at least partially cover one side of the module case.

[0017] The above blocking member may be configured to extend long along the stacking direction of the battery cells.

[0018] The above blocking members may be provided in multiple numbers and arranged to be spaced apart from each other along the length direction of the battery cell.

[0019] The pack case may have a venting device configured to discharge venting gas generated from the battery cell to the outside, and the blocking member may be configured to guide the venting gas toward the venting device.

[0020] The pack case may have a cross beam interposed between the plurality of battery cells, and the blocking member may be configured to be coupled to the cross beam.

[0021] The above cross beams may be provided in multiple numbers and arranged along the stacking direction of the multiple battery cells, and the blocking member may be configured to cross at least some of the multiple cross beams.

[0022] The above blocking member may have a joining groove configured to allow an end of the cross beam to be inserted therein.

[0023] The above cross beam may have a support configured to prevent the blocking member from moving in the left-right direction.

[0024] The above pack case may have a protrusion configured to protrude inwardly from the inner side to limit movement of the blocking member.

[0025] And, the present invention provides a vehicle characterized by including a battery pack according to one embodiment of the present invention.

[0026] According to one aspect of the present invention, since the venting path can be separated by the blocking member, the movement of venting gas, flames, etc. beyond the blocking member toward other battery cells can be prevented. In other words, according to this aspect of the present invention, the transfer of gas, flames, etc. to other battery cells and the resulting thermal runaway can be effectively prevented or delayed. This ensures the safety and reliability of the battery pack.

[0027] In addition, according to one aspect of the present invention, in the event of an abnormal situation of the battery module, the gap between the battery cell and the pack case can be maintained at a constant level by the blocking member, so that a path for discharging high-temperature gas or flames generated from the battery cell can be secured.

[0028] That is, according to the above aspect of the present invention, even if a thermal event occurs in some battery cells within the battery module, gas or flames can move smoothly from the outside of the battery module.

[0029] Furthermore, according to one aspect of the present invention, since the blocking member is coupled to the cross beam, the position of the blocking member can be stably maintained even if the module case is damaged by heat. This ensures that the blocking member's venting path separation and gap maintenance functions between the battery module and the pack case can be stably ensured.

[0030] And, according to another aspect of the present invention, it is possible to prevent or delay an event due to thermal runaway phenomenon, such as a fire or explosion, in a battery pack including a plurality of battery modules or a device equipped with the same.

[0031] 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.

[0032] 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.

[0033] FIG. 1 is a perspective view of a battery pack according to one embodiment of the present invention.

[0034] Figure 2 is an exploded perspective view of a battery pack according to one embodiment of the present invention.

[0035] FIG. 3 is a perspective view showing the inside of a battery pack according to one embodiment of the present invention.

[0036] FIG. 4 is an exploded perspective view of a battery module included in a battery pack according to one embodiment of the present invention.

[0037] Fig. 5 is a cross-sectional view of a battery pack to which a blocking member according to one embodiment of the present invention is applied. For example, Fig. 5 may be a drawing showing the cross-section taken along line I-I' of Fig. 1.

[0038] FIG. 6 is a cross-sectional view of a battery pack when a thermal event occurs in the battery pack according to one embodiment of the present invention.

[0039] FIG. 7 is a drawing for explaining the direction of movement of venting gas when a thermal event occurs in a battery pack according to one embodiment of the present invention.

[0040] FIG. 8 is a drawing for explaining the joint structure of a blocking member and a cross beam in a battery pack according to one embodiment of the present invention.

[0041] FIG. 9 is an exploded view of a blocking member in a battery pack according to one embodiment of the present invention.

[0042] Fig. 10 is a cross-sectional view of a battery pack according to one embodiment of the present invention. For example, Fig. 10 may be a drawing illustrating cross-section II-II' of Fig. 1.

[0043] FIG. 11 is a drawing for explaining the joint structure of a blocking member and a cross beam in a battery pack according to another embodiment of the present invention.

[0044] Fig. 12 is a cross-sectional view of a battery pack according to another embodiment of the present invention. For example, Fig. 12 may be a drawing showing cross-section Ⅲ-Ⅲ' of Fig. 1.

[0045] Fig. 13 is a cross-sectional view of a battery pack according to another embodiment of the present invention. For example, Fig. 13 may be a drawing showing cross-section Ⅲ-Ⅲ' of Fig. 1.

[0046] FIG. 14 is a schematic perspective view of a vehicle including a battery pack according to one embodiment of the present invention.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052]

[0053] FIG. 1 is a perspective view of a battery pack according to one embodiment of the present invention, FIG. 2 is an exploded perspective view of a battery pack according to one embodiment of the present invention, and FIG. 3 is a perspective view showing the inside of a battery pack according to one embodiment of the present invention.

[0054] Referring to FIGS. 1 to 3, 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).

[0055] First, referring mainly to FIG. 2, the battery cell (100) may be included in multiple numbers. Although not shown in the drawing, the multiple 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 multiple battery cells (100) may be electrically connected to each other.

[0056] The above battery cell (100) may be a pouch-type secondary battery. The cell case of such a pouch-type secondary battery may be configured in the form of a pouch in which a metal layer made of aluminum is interposed between polymer layers.

[0057] A plurality of battery cells (100) can be arranged in a parallel manner in the front-back direction (Y-axis direction) while standing vertically (Z-axis direction), as illustrated in FIG. 2. At this time, each battery cell (100) can have its sealing portion facing left-right (X-axis direction) and upward (+Z-axis direction), and its storage portion facing forward-backward (Y-axis direction).

[0058] 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 goes without saying that a cylindrical or square secondary battery may be applied as the battery cell (100).

[0059] The pack case (200) may be configured to accommodate a plurality of battery cells (100). That is, the pack case (200) may provide a space for accommodating a plurality of battery cells (100). The pack case (200) may be made of a material that can ensure mechanical rigidity, such as a metal such as steel or SUS, or a plastic, or may include such a material, in order to safely protect the battery cells (100) accommodated therein.

[0060] The above blocking member (300) may be provided on the outside of the battery cell (100). The blocking member (300) may be provided in the space between the pack case (200) and the battery cell (100). For example, as in the embodiment illustrated in FIG. 3, the blocking member (300) may be provided on the upper side of the battery cell (100).

[0061] The blocking member (300) may be configured to extend long along at least one direction. For example, as in the embodiment illustrated in FIG. 3, the blocking member (300) may be configured to extend long along the stacking direction of the plurality of battery modules (10) (the Y-axis direction in FIG. 3). That is, the blocking member (300) may be configured to extend long along the front-rear direction of the pack case (200).

[0062] The blocking member (300) may be configured to partition the space between the battery cell (100) and the pack case (200). In particular, the blocking member (300) may be configured to extend from one end of the battery cell (100) stack to the other end. That is, the blocking member (300) may be configured to overlap at least some of the plurality of battery cells (100) arranged in the front-rear direction.

[0063] According to the above-described embodiment of the present invention, since the blocking member (300) is provided, the battery cells (100) can be separated into compartments in the outer space of the battery cells (100). That is, the venting paths of the battery cells (100) can be separated by the blocking member (300).

[0064] Specifically, when a thermal event occurs in one battery cell (100), venting gas or flame, etc. may flow into the space between the battery cell (100) and the pack case (200), and there is a concern that such venting gas or flame, etc. may be transferred from the space between the battery cell (100) and the pack case (200) to another adjacent battery cell (100). However, according to the above-described embodiment of the present invention, when a thermal event occurs in one battery cell (100), it is possible to suppress high-temperature venting gas or flame, etc. from being transferred from the space between the battery cell (100) and the pack case (200) to the adjacent battery cell (100) (see the bold arrow in FIG. 3).

[0065] Accordingly, according to the above-described embodiment of the present invention, thermal runaway propagation between battery cells (100) can be effectively prevented or delayed. Accordingly, the safety and reliability of the battery pack (1) can be guaranteed.

[0066] Moreover, the blocking member (300) may be configured to be coupled to the pack case (200). The blocking member (300) may be detached from the space between the battery cell (100) and the pack case (200) due to gravity, impact, heat, etc. However, according to the above-described embodiment of the present invention, since the blocking member (300) is coupled to the pack case (200), the position of the blocking member (300) can be stably maintained. Accordingly, the structural stability of the battery pack (1) can be secured, and the venting path separation function of the blocking member (300) of the battery cell (100) can be stably guaranteed.

[0067]

[0068] Meanwhile, referring to FIG. 2, a pack case (200) according to one embodiment of the present invention may include a base frame (210) and a side frame (220).

[0069] The above 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 so 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 cells (100) are stably mounted.

[0070] 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). More specifically, the side frame (220) may include a rear wall located at the +Y direction side end of the base frame (210), a right wall located at the -X direction side end, a front wall located at the -Y direction side end, and a left wall located at the +X direction side end to form a side of the pack case (200).

[0071] The pack case (200) may be provided with a cross beam (230). The cross beam (230) may be interposed between a plurality of battery cells (100). The cross beam (230) may be provided to partition between the plurality of battery cells (100). For example, the cross beam (230) may be formed in the form of a partition wall that extends long in the left-right direction (X-axis direction of FIG. 2) of the battery pack (1) and may be interposed between battery cells (100) that are adjacently arranged in the front-back direction (Y-axis direction of FIG. 2) of the battery pack (1). The cross beam (230) may be arranged parallel to the rear wall and the front wall of the side frame (220).

[0072] Additionally, the pack case (200) may further include a pack lid (240). The pack lid (240) may be configured to cover the upper portion of the plurality of battery cells (100). The pack lid (240) may be provided to be coupled to the upper portion of the side frame (220) to form the upper surface of the pack case (200).

[0073] The pack lid (240) can protect components stored inside, such as battery cells (100), and prevent venting gases and / or sparks discharged from the battery cells (100) from being discharged to the outside, particularly the upper part, of the pack case (200).

[0074]

[0075] FIG. 4 is an exploded perspective view of a battery module included in a battery pack according to one embodiment of the present invention.

[0076] Meanwhile, referring to FIG. 4, 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 inside the pack case (200). For example, as in the embodiment illustrated in FIG. 2, 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] The module case (11) may include a case body (11a) and a top plate (11b). The case body (11a) may be configured to accommodate a battery cell (100). The case body (11a) may be made of a metal material having rigidity and heat resistance to physically or chemically protect the accommodated battery cell (100).

[0082] At this time, the upper surface and the front and rear surfaces of the case body (11a) can be opened. For example, the case body (11a) can be provided as a U-frame. When the case body (11a) is provided as a U-frame, it can be provided to cover both sides and the lower surface of the plurality of battery cells (100). The case body (11a) can include a left plate and a right plate that cover both sides of the plurality of battery cells (100), and a lower plate that covers the lower surfaces of the plurality of battery cells (100). In addition, the left plate, the right plate, and the lower plate can be configured in an integrated form.

[0083] The top plate (11b) may be provided to form the upper surface of the module case (11). When the case body (11a) is provided as a U-frame, the top plate (11b) may be coupled to the open upper surface of the case body (11a). The top plate (11b) may be welded to the case body (11a) to be coupled to each other. At this time, the shape in which the top plate (11b) and the case body (11a) are coupled may be a square tubular shape with open front and back surfaces.

[0084] In addition, the module case (11) may include an end plate (11c) provided on the open front and rear sides of the case body (11a). The end plate (11c) may be welded and joined to the case body (11a). Meanwhile, although not shown for convenience, the end plate (11c) may, for example, have an inner side made of an insulating material and an outer side made of a metal material. In addition, the end plate (11c) may partially have holes or slits for exposing components that need to be exposed to the outside, such as a positive terminal and a negative terminal of the battery module (10) or a connector.

[0085] In addition, the module case (11) can be formed in various other shapes. For example, the module case (11) can be provided with a box-shaped lower case having an upper open end and an upper cover that closes the upper open end of the lower case. Alternatively, the module case (11) can be provided with a monoframe. For example, the case body (11a) can be configured in the shape of a square tube having an upper surface, a lower surface, a left surface, and a right surface, and having an open front and rear surface.

[0086]

[0087] In addition, a venting hole (H) may be formed in the module case (11). The venting hole (H) may be configured to allow venting gas generated in the battery cell (100) to be discharged to the outside of the module case (11). The venting hole (H) may be formed on one side of the module case (11), and directional venting in one direction may be possible. For example, the venting hole (H) may be formed on the upper surface of the module case (11).

[0088] For example, a venting hole (H) is formed in the top plate (11b), and directional venting of the battery module (10) toward the top may be possible through the venting hole (H). A plurality of venting holes (H) may be provided, and may be provided at regular intervals in the horizontal direction (X-axis, Y-axis direction).

[0089] In this way, the venting hole (H) 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 (H) is sealed, and the gas or flame can be discharged in a straight line toward the venting hole (H).

[0090] 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 (H) provided at the upper portion of the battery cell (100), thereby facilitating venting.

[0091]

[0092] Meanwhile, the battery module (10) according to one embodiment of the present invention may further include a module cover (12).

[0093] Referring to FIG. 4, the module cover (12) may be configured to at least partially cover one side of the module case (11) in which the venting hole (H) is formed. For example, the module cover (12) may be configured to cover the top plate (11b). The module cover (12) may be provided on the outside and / or inside of the module case (11).

[0094] In particular, the module cover (12) may be configured to cover the venting hole (H). For example, the module cover (12) may be configured in a sheet shape and may be mounted on the upper surface of the battery cell (100). The module cover (12) may be configured to cover a plurality of venting holes (H) at once.

[0095] The module cover (12) may be configured to prevent venting gases or flames, etc., emitted when a thermal event occurs within the battery module (10) from being transferred to other battery cells (100). To this end, the module cover (12) may be made of a material having excellent heat and / or fire resistance, such as a mica sheet or a silicone composite material.

[0096] Accordingly, the module cover (12) can maintain morphological stability without deformation even when high temperature heat is generated, and thus can stably block high temperature gases or flames generated from the battery cell (100).

[0097] According to the above-described embodiment of the present invention, since the module cover (12) is made of a hard and heat-resistant material, deformation due to high-temperature gas or flames can be minimized.

[0098] Such a module cover (12) may be configured to be at least partially openable by venting gas or flame, etc. Specifically, at least a portion of the module cover (12) may be configured to be ruptured by the pressure or heat of the venting gas directed toward the venting hole (H). Alternatively, at least a portion of the module cover (12) may be configured to be completely detachable.

[0099] For this purpose, the module cover (12) may be provided with a notch (N). The notch (N) may be configured to be opened by venting gas to discharge the venting gas to the outside of the battery module (10).

[0100] The notching portions (N) may be provided in multiple numbers, and may be provided at regular intervals in the horizontal direction (X-axis, Y-axis direction). In particular, the notching portions (N) may be formed at a position corresponding to the venting hole (H). In addition, the notching portions (N) may be configured in a shape corresponding to the venting hole (H).

[0101] According to the above-described embodiment of the present invention, when a thermal event occurs in a specific battery cell (100), a notch (N) provided on one side of the specific battery cell (100) may rupture, thereby opening at least one of a plurality of venting holes (H). Accordingly, venting gas or the like may be discharged to the outside of the module case (11) through the opened venting hole (H).

[0102] In addition, the module cover (12) can prevent gas or flame discharged to the outside of the module case (11) from flowing back into the inside of the battery module (10). That is, the venting hole (H) provided on the side of the battery cell (100) where no thermal event has occurred can be maintained in a closed state without being opened. Accordingly, the venting gas or flame discharged to the outside through the open venting hole (H) can be fundamentally blocked from flowing back into the inside of the battery module (10). In addition, the module cover (12) that remains unruptured can block not only heat but also high-temperature gas, flame, discharge, etc. generated from the battery cell (100).

[0103] That is, according to the above-described embodiment of the present invention, when thermal runaway occurs in the battery module (10), not only can the venting gas or flame generated inside the battery module (10) be smoothly discharged to the outside of the battery module (10), but also the discharged venting gas or flame can be prevented from flowing back into the battery module (10). Accordingly, the propagation of thermal runaway can be effectively prevented or delayed by minimizing the heat propagation to neighboring battery cells (100) or battery modules (10).

[0104]

[0105] FIG. 5 is a cross-sectional view of a battery pack to which a blocking member according to one embodiment of the present invention is applied. For example, FIG. 5 may be a drawing illustrating the cross-section taken along line I-I' of FIG. 1. In addition, FIG. 6 is a cross-sectional view of a battery pack according to one embodiment of the present invention when a thermal event occurs in the battery pack.

[0106] Meanwhile, since the pack case (200) and the module case (11) are spaced apart by a predetermined distance, venting gas or flames, etc. can move into the spaced apart space. That is, a venting path can be formed in the space between the blocking member (300), the pack case (200), and the module case (11). The blocking member (300) can be provided on the outside of the battery module (10). That is, the blocking member (300) can be provided in the space between the pack case (200) and the module case (11).

[0107] As in the embodiment illustrated in FIGS. 5 and 6, when a venting hole (H) is formed on the upper surface of the module case (11), a blocking member (300) may be provided in the space between the pack lid (240) and the upper surface of the module case (11).

[0108] According to the above-described embodiment of the present invention, when a thermal event occurs in a battery module (10), high-temperature venting gas or flames can be suppressed from moving from the space between the module case (11) and the pack case (200) to the adjacent venting path.

[0109]

[0110] Furthermore, the blocking member (300) may be configured to maintain a gap between the pack case (200) and the module case (11). The blocking member (300) may be configured to suppress upward movement of the module case (11).

[0111] If the blocking member (300) is not provided, when thermal runaway occurs within the battery module (10), the shape of the module case (11) may be deformed by the pressure of the gas discharged from the battery cell (100) and / or the high heat of dust or flames. For example, a portion of the upper surface of the module case (11) may swell upward, and an adjacent portion may, conversely, swell downward. As a result, the gap between the module case (11) and the pack case (200) may be reduced in the portion where the upper surface of the module case (11) swells upward, so that a path for the venting gas to move may not be secured.

[0112] However, according to one embodiment of the present invention, since the blocking member (300) is provided, the module case (11) can be prevented from being bent or deformed due to pressure and / or heat of the venting gas, etc. Accordingly, according to the above-described embodiment of the present invention, the gap between the module case (11) and the pack case (200) can be maintained. Accordingly, since the venting gas, flame, etc. can smoothly move through the venting path, the thermal runaway of the battery module (10) can be suppressed or prevented. Accordingly, the safety and reliability of the battery module (10) can be guaranteed.

[0113] The blocking member (300) may be provided as a rigid body. Here, the rigid body is in contrast to an elastic body, and for example, the blocking member (300) may be provided with a material such as a metal such as SUS or aluminum, or a reinforced fiber plastic. Accordingly, the mechanical rigidity of the blocking member (300) is increased, and since elastic deformation is almost non-existent, the gap between the module case (11) and the pack case (200) can be maintained at a constant level even when an impact is applied from the outside.

[0114] Additionally, the blocking member (300) may be made of a material having fire-resistant and / or heat-resistant properties. For example, the blocking member (300) may be made of a material such as flame-retardant plastic or mica. According to the above-described embodiment of the present invention, the blocking member (300) can be prevented from melting or disappearing due to high heat such as flame. However, the material of the blocking member (300) is not limited thereto.

[0115] And, as in the embodiments illustrated in FIGS. 5 and 6, the blocking member (300) may be configured to be in contact with the pack case (200). That is, the pack case (200) may be configured to be able to be seated on the blocking member (300). In addition, the blocking member (300) may be configured to correspond to the gap between the module case (11) and the pack case (200).

[0116] According to the above-described embodiment of the present invention, the module case (11) can be more reliably prevented from being lifted. In addition, the blocking member (300) can be configured to act as a stopper when a thermal event of the battery cell (100) occurs and the pack case (200) is about to sag downward. That is, since the blocking member (300) structurally supports the pack case (200), the pack case (200) can be prevented from sagging due to gravity.

[0117] Accordingly, according to the above-described embodiment of the present invention, the gap between the blocking member (300) and the pack case (200) is minimized, so that the gap between the module case (11) and the pack case (200) can be more reliably maintained.

[0118] Moreover, according to the above-described embodiment of the present invention, venting gas, etc. can be further suppressed from flowing beyond the blocking member (300) to another venting path.

[0119]

[0120] Referring to FIGS. 5 and 6, the blocking member (300) may be provided on one side of the module case (11) where the venting hole (H) is formed. That is, the blocking member (300) may be provided on the same side as the venting hole (H). For example, the venting hole (H) may be formed in the top plate (11b), and the blocking member (300) may be provided on the outside of the top plate (11b).

[0121] In this case, the blocking member (300) may be provided between adjacent venting holes (H). That is, the blocking member (300) may be provided at a position that is intersected with the venting holes (H).

[0122] As described above, the venting holes (H) may be provided in multiple numbers, and may be provided at regular intervals in the horizontal direction (X-axis, Y-axis direction). As in the embodiment illustrated in FIGS. 5 and 6, the blocking member (300) may be provided between adjacent venting holes (H) among the venting holes (H) arranged in a row along the longitudinal direction of the battery cell (100) (X-axis direction in FIG. 5).

[0123] In addition, the cross-sectional area of ​​the blocking member (300) may be provided to be smaller than the area of ​​the space between adjacent venting holes (H). Accordingly, the blocking member (300) may not shield the venting holes (H), and thus may not prevent the venting gas from being discharged through the venting holes (H).

[0124] Accordingly, as indicated by the arrows in FIG. 6, when a thermal event occurs in the battery cell (100), venting gas or the like can move into the space between the blocking members (300). That is, according to the above-described embodiment of the present invention, a venting path for the venting gas is secured between the blocking members (300), so that thermal runaway propagation between the battery cells (100) can be effectively prevented or delayed.

[0125] Meanwhile, the density of the blocking member (300) may be configured differently depending on the position where the venting hole (H) is formed. Here, the density of the blocking member (300) may refer to the number of blocking members (300) per unit area of ​​the top plate (11b) or the area occupied by the blocking member (300). The area or number of the blocking members (300) may be freely adjusted depending on the area or number of the venting hole (H).

[0126] In particular, the blocking member (300) may be provided more densely in a portion where the module case (11) is likely to be lifted. For example, the blocking member (300) may be provided in a portion adjacent to the venting hole (H).

[0127] When venting gas or flames are discharged from the venting hole (H), there is a high possibility that the portion adjacent to the venting hole (H) will swell due to the heat of the venting gas or flames. Therefore, as in the above-described embodiment of the present invention, by providing the blocking member (300) in the portion adjacent to the venting hole (H), the module case (11) provided with the venting hole (H) can be more effectively suppressed from swelled.

[0128]

[0129] FIG. 7 is a drawing for explaining the direction of movement of venting gas when a thermal event occurs in a battery pack according to one embodiment of the present invention.

[0130] The blocking member (300) may be configured to extend long along the stacking direction of the battery cells (100). In particular, the blocking member (300) may be configured to extend long along the stacking direction of the plurality of battery modules (10). That is, in the embodiment of FIG. 7, the blocking member (300) may be configured to extend long along the front-rear direction of the battery pack (10).

[0131] In particular, the blocking member (300) may be configured to extend from one end of the stack of battery modules (10) to the other end. That is, the blocking member (300) may be configured to overlap at least a portion of a plurality of battery modules (10).

[0132] According to the above-described embodiment of the present invention, even if a thermal event occurs in a battery module (10) and venting gas or the like is discharged, it can be prevented from passing over the blocking member (300) and heading toward another battery module (10).

[0133] Additionally, a plurality of blocking members (300) may be provided. The plurality of blocking members (300) may be arranged to be spaced apart from each other by a predetermined distance in the horizontal direction. In particular, the plurality of blocking members (300) may be arranged to be spaced apart from each other along the longitudinal direction of the battery cell (100).

[0134] A plurality of blocking members (300) may be provided symmetrically with respect to the center of the side frame (220). For example, two blocking members (300) may be provided on each side of the pack case (200).

[0135] At this time, a venting path configured to allow venting gas, etc. to flow between adjacent blocking members (300) may be formed. The blocking member (300) may be configured to block venting gas, etc. from moving beyond the blocking member (300) to another venting path.

[0136] According to the above-described embodiment of the present invention, the venting gas, etc. of the venting path can only flow within one venting path without moving toward another adjacent venting path. That is, the movement of the venting gas, etc. between the venting paths that are adjacent to each other in the left-right direction (X-axis direction) with one blocking member (300) in the middle can be restricted.

[0137] In particular, a blocking member (300) may be provided between adjacent venting holes (H). Accordingly, venting gas, etc. discharged from the venting hole (H) can immediately move to the venting path formed between adjacent blocking members (300).

[0138] The venting path may be configured to be elongated along the front-back direction (the stacking direction of the battery cells (100)), such as the direction in which the blocking member (300) extends. In addition, the blocking member (300) may be configured to guide the fluid flowing through the venting path in at least one direction in the outer space of the module case (11).

[0139] More specifically, the venting path may be configured to be open at both longitudinal ends. Venting gas may be discharged from both longitudinal ends of the venting path. In this case, the blocking member (300) may guide the venting gas to flow toward both ends of the venting path.

[0140] If the gas generated inside the battery module (10) is discharged in multiple directions, the time for discharging the venting gas may become longer, which may significantly reduce the safety of the battery module (10). However, according to the above-described embodiment of the present invention, since the venting path is formed by the blocking member (300), directional venting of the venting gas can be more effectively induced outside the module case (11). That is, according to the above-described embodiment of the present invention, the spreading of the venting gas or a fluid such as a flame in all directions outside the module case (11) can be minimized. Accordingly, the blocking member (300) can guide the venting gas flowing in the venting path in one direction, thereby smoothly discharging it to the outside of the pack case (200).

[0141]

[0142] Meanwhile, referring to FIGS. 2 and 7, the pack case (200) may be equipped with a venting device (V). The venting device (V) may be configured to discharge gas generated from the battery cells (100) housed therein to the outside of the pack case (200). The venting device (V) may be equipped in the form of a hole penetrating between the inside and the outside of the pack case (200).

[0143] Alternatively, the venting device (V) may be configured to be mountable in a hole of the pack case (200) and may be provided in the form of a venting device that operates when venting gas is generated inside the pack case (200).

[0144] For example, the venting device (V) may be provided with a venting valve or implemented as such a venting valve. In this case, a mounting hole may be formed in the side frame (220) so that the venting device (V) can be configured to be mounted in the mounting hole. In the case where the venting device (V) is provided with a venting valve or implemented in the form of such a venting valve, when the internal pressure of the pack case (200) increases, the venting valve may be configured to open and discharge the venting gas to the outside of the pack case (200).

[0145] The venting device (V) may be provided on the side of the pack case (200), i.e., on the side frame (220). A plurality of venting devices (V) may be provided. In particular, the venting devices (V) may be located on at least some of the unit walls of the side frame (220). In addition, the venting devices (V) 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. 2, a plurality of venting devices (V) may be provided on each of the front wall and the rear wall. At this time, the plurality of venting devices (V) may be provided to be symmetrical to each other with respect to the center of the side frame (220).

[0146] 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).

[0147] Meanwhile, the number or location of the venting devices (V) described based on the embodiment of Fig. 2, etc., is merely an example, and can be changed to various other numbers or locations, of course.

[0148] The blocking member (300) may be configured to guide venting gas, etc., to the venting device (V). For example, the blocking member (300) may be provided to extend long toward the venting device (V). Accordingly, the venting gas, etc., moving through the venting path between the blocking members (300) may be directed toward the venting device (V).

[0149] At this time, as in the embodiment illustrated in Fig. 7, a plurality of blocking members (300) may be provided in parallel with each other so that the spacing between the blocking members (300) may be maintained constant. At least one venting device (V) may be provided between these blocking members (300).

[0150] According to the above-described embodiment of the present invention, when a thermal event occurs in a battery cell (100), the blocking member (300) guides the venting gas, etc. inside the venting path toward the venting device (V), thereby quickly discharging the venting gas, etc. 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 cells (100).

[0151]

[0152] FIG. 8 is a drawing for explaining the joint structure of a blocking member and a cross beam in a battery pack according to one embodiment of the present invention, and FIG. 9 is an exploded view of the blocking member in a battery pack according to one embodiment of the present invention. In addition, FIG. 10 is a cross-sectional view of a battery pack according to one embodiment of the present invention. For example, FIG. 10 may be a drawing showing a cross-section taken along line II-II' of FIG. 1.

[0153] Meanwhile, the blocking member (300) may be configured to be coupled to the cross beam (230). The blocking member (300) may be configured to be coupled to the upper surface of the cross beam (230). The blocking member (300) may be configured to be coupled to the upper end of the cross beam (230).

[0154] According to the above-described embodiment of the present invention, since the blocking member (300) is coupled to the cross beam (230) of the pack case (200), the coupling structure between the blocking member (300) and the pack case (200) can be stably maintained.

[0155] In particular, a plurality of cross beams (230) may be provided and arranged along the stacking direction of the plurality of battery cells (100). At this time, the blocking member (300) may be configured to cross at least some of the plurality of cross beams (230). That is, the blocking member (300) may be configured to extend long along the stacking direction of the plurality of battery cells (100) and be coupled to at least some of the plurality of cross beams (230). At this time, the blocking member (300) may be arranged to be approximately perpendicular to the extending direction of the cross beams (230).

[0156] When a thermal event occurs in the battery cell (100), the top plate (11b) of the battery module (10) may be deformed or lost due to the heat. However, according to the above-described embodiment of the present invention, since the blocking member (300) is coupled to the plurality of cross beams (230), the blocking member (300) can be stably maintained without moving or deforming. Furthermore, even if the pack lead (240) is deformed downward by the heat, it can be supported by the blocking member (300) coupled to the plurality of cross beams (230). Accordingly, the functions of the blocking member (300) to separate the venting path and maintain the venting path gap can be stably ensured.

[0157] Meanwhile, the cross beam (230) may be configured to protrude upward from the battery cell (100) or the battery module (10). At this time, the blocking member (300) may be configured to be simultaneously seated on the cross beam (230) and the battery module (10). The cross beam (230) may be provided to be spaced apart from the pack lead (240) by a predetermined distance, and the blocking member (300) may be provided in the space between the cross beam (230) and the pack lead (240). Furthermore, the blocking member (300) may be configured to fill the space between the cross beam (230) and the pack lead (240). That is, the blocking member (300) may be configured to simultaneously fill not only the space between the battery module (10) and the pack lead (240), but also the space between the cross beam (230) and the pack lead (240).

[0158] Accordingly, in the event of an abnormal situation of the battery cell (100), the gap between the pack cases can be maintained at a constant level even at the upper portion of the cross beam (230) by the blocking member (300), thereby securing a path for the discharge of high-temperature gas or flames generated in the battery module. At the same time, the movement of venting gas or flames flowing through a certain venting path to another venting path can be completely blocked.

[0159] For example, as in the embodiment illustrated in the drawing, four cross beams (230) may be arranged on each side of the pack case (200), and the blocking member (300) may be configured to be coupled to each of the four cross beams (230). According to the above-described embodiment of the present invention, the venting path can be completely separated and partitioned by the blocking member (300).

[0160]

[0161] As a more specific example, as in the embodiments illustrated in FIGS. 8 to 10, the blocking member (300) and the cross beam (230) may be configured to be interlocked. The upper portion of the cross beam (230) may be configured to be at least partially inserted into the blocking member (300). The blocking member (300) may be configured to be prevented from moving forward and backward by being caught by the cross beam (230).

[0162] Specifically, a coupling groove (310) may be formed in the cross beam (230). The coupling groove (310) may be configured such that an end of the cross beam (230) may be inserted therein. A plurality of coupling grooves (310) may be provided. The coupling grooves (310) may be formed in the blocking member (300) to correspond to the position and number of the cross beams (230). In addition, the thickness of the coupling groove (310) may be configured to correspond to the thickness of the cross beam (230).

[0163] In addition, the height of the coupling groove (310) can be configured to correspond to the gap between the battery module (10) and the cross beam (230). Accordingly, the blocking member (300) can be configured to be simultaneously seated on not only the battery module (10) but also the cross beam (230).

[0164] According to the above-described embodiment of the present invention, the blocking member (300) can be connected to the pack case (200) with a simple structure. Furthermore, when the blocking member (300) is connected to the cross beam (230), the assembly position of the blocking member (300) can be guided. As a result, the assembling efficiency of the battery pack (1) can be improved. In addition, according to the above-described embodiment of the present invention, since no other connecting structure, such as a separate adhesive member, is required, the productivity can be improved during the manufacturing of the battery pack (1).

[0165] Moreover, according to the above-described embodiment of the present invention, the upper end of the cross beam (230) can be provided in close contact with the joining groove (310) without a gap. That is, the sealing force between the blocking member (300) and the pack case (200) can be stably secured. Accordingly, according to the above-described embodiment of the present invention, it is possible to more reliably prevent venting gas or flames, etc. from moving beyond the blocking member (300) toward the adjacent venting passage. Therefore, according to the above-described embodiment, a plurality of venting passages can be more reliably separated in the space between the module case (11) and the pack case (200).

[0166] In addition, according to the above-described embodiment of the present invention, since the joining groove (310) is formed in the blocking member (300), movement in the forward and backward direction can be suppressed. Accordingly, since the movement of the blocking member (300) can be restricted, the arrangement between the blocking member (300) and the pack case (200) can be stably maintained.

[0167]

[0168] Fig. 11 is a drawing for explaining the joint structure of a blocking member and a cross beam in a battery pack according to another embodiment of the present invention. In addition, Fig. 12 is a cross-sectional view of a battery pack according to another embodiment of the present invention. For example, Fig. 12 may be a drawing showing the cross-section Ⅲ-Ⅲ' of Fig. 1.

[0169] As another example, the blocking member (300) may be configured to be restricted from moving in the left-right direction as well as the forward-backward direction. More specifically, the cross beam (230) may include a support member (231). The support member (231) may be configured to prevent the blocking member (300) from moving in the left-right direction.

[0170] The support member (231) may be configured to protrude outward from the upper surface of the cross beam (230). A plurality of such support members (231) may be provided. The support members (231) may be provided on both sides in the width direction of the blocking member (300). That is, the blocking member (300) may be configured to be interposed in the space between adjacent support members (231). In particular, a plurality of support members (231) may be individually provided for each blocking member (300).

[0171] According to the above-described embodiment of the present invention, since the blocking member (300) can be supported on both left and right sides by the support member (231), the fixing force between the blocking members (300) can be more stably secured. As a result, the arrangement of the blocking member (300) and the pack case (200) can be more stably maintained.

[0172] Moreover, according to the above-described embodiment of the present invention, when assembling the blocking member (300) to the cross beam (230), the assembly position of the blocking member (300) can be guided more reliably, so that the assembling property of the battery pack (1) can be improved.

[0173]

[0174] Fig. 13 is a cross-sectional view of a battery pack according to another embodiment of the present invention. For example, Fig. 13 may be a drawing showing cross-section Ⅲ-Ⅲ' of Fig. 1.

[0175] As another example, the blocking member (300) may be configured to be coupled not only with the cross beam (230) but also with the pack case (200). For example, as in the embodiment illustrated in FIG. 13, the pack case (200) may have a protrusion (250). The protrusion (250) may be configured to limit the movement of the blocking member (300). The protrusion (250) may be configured to protrude inwardly from the inner surface of the pack case (200). The protrusion (250) may be configured to protrude inwardly from the inner surface of the pack lid (240).

[0176] These protrusions (250) may be configured such that the ends of the blocking member (300) are inserted therein. A plurality of protrusions (250) may be provided. The protrusions (250) may be provided on both sides of the width direction of the blocking member (300). That is, the blocking member (300) may be configured such that it is interposed in the space between adjacent protrusions (250).

[0177] In particular, a plurality of protrusions (250) may be individually provided for each blocking member (300). The protrusions (250) may be provided on the upper portion of the cross beam (230). Alternatively, the protrusions (250) may be provided on the upper portion of the battery module (10). Furthermore, the protrusions (250) may be configured to come into contact with the cross beam (230) or the battery module (10).

[0178] According to the above-described embodiment of the present invention, when the pack lead (240) is coupled to the side frame (220), the blocking member (300) can be naturally inserted between adjacent protrusions (250). Accordingly, the coupling position of the pack lead (240) can be guided, so that the assembly efficiency can be improved when assembling the battery module (10).

[0179] In addition, according to the above-described embodiment of the present invention, since the blocking member (300) can be inserted and fixed between the protrusions (250), the fixing force between the blocking member (300) and the pack lead (240) can be further improved.

[0180] In particular, according to the above-described embodiment of the present invention, the movement of the blocking member (300) in the left-right direction can be restricted. Accordingly, the possibility of high-temperature and high-pressure venting gas or flames pushing the blocking member (300) in the left-right direction or the blocking member (300) being separated from the cross beam (230) due to the internal pressure of the venting gas can be reduced. Accordingly, the arrangement state of the blocking member (300) can be stably maintained.

[0181]

[0182] FIG. 14 is a schematic perspective view of a vehicle including a battery pack according to one embodiment of the present invention.

[0183] Referring to FIG. 14, a vehicle (3) according to one embodiment of the present invention may include one or more battery packs (1) according to the above-described embodiments. 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-wheeled vehicle and a two-wheeled vehicle. The vehicle (3) may operate by receiving power from a battery pack (1) or a battery module (10) according to one embodiment of the present invention.

[0184]

[0185] 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 including a blocking member coupled to the pack case and configured to extend long along at least one direction.

2. In paragraph 1, Further comprising a module case configured to accommodate the plurality of battery cells by grouping them, A battery pack, characterized in that the blocking member is configured to maintain a gap between the pack case and the module case.

3. In paragraph 2, The above module case has a plurality of venting holes formed on one side to discharge venting gas generated from the battery cell to the outside, A battery pack characterized in that the above blocking member is provided between adjacent venting holes.

4. In paragraph 2, A battery pack further comprising a module cover configured to at least partially cover one side of the module case.

5. In paragraph 1, A battery pack characterized in that the blocking member is configured to extend long along the stacking direction of the battery cells.

6. In paragraph 1, A battery pack characterized in that the above blocking members are provided in plurality and arranged to be spaced apart from each other along the length direction of the battery cells.

7. In paragraph 1, The above pack case is A venting device is provided that is configured to discharge venting gas generated in the above battery cell to the outside, A battery pack, characterized in that the blocking member is configured to guide the venting gas toward the venting device.

8. In paragraph 1, The above pack case has a cross beam interposed between the plurality of battery cells, A battery pack, characterized in that the blocking member is configured to be coupled to the cross beam.

9. In paragraph 8, The above cross beams are provided in multiple numbers and arranged along the stacking direction of the multiple battery cells, A battery pack, wherein the blocking member is configured to cross at least a portion of the plurality of cross beams.

10. In paragraph 8, A battery pack characterized in that the blocking member has a joining groove configured to be inserted into an end of the cross beam.

11. In paragraph 8, A battery pack characterized in that the cross beam has a support configured to prevent the blocking member from moving in the left-right direction.

12. In paragraph 1, A battery pack characterized in that the pack case has a protrusion configured to protrude inward from the inner side and restrict movement of the blocking member.

13. A vehicle comprising a battery pack according to any one of paragraphs 1 to 12.

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