Battery pack and vehicle comprising same

Abstract

The present invention relates to a battery pack, the battery pack comprising: a plurality of battery cells; and a pack case housing the plurality of battery cells, and provided with first venting channels corresponding to at least a portion of the plurality of battery cells, and recessed inward from the inner surface so as for the venting gas generated from the battery cells to flow thereinto.

Description

Battery pack and vehicle including same

[0001] The present invention relates to a battery pack, and more particularly, to a battery pack with enhanced safety and a vehicle including the same.

[0002] This application claims priority to Korean Patent Application No. 10-2024-0079870, filed on June 19, 2024, and all contents disclosed in the specification and drawings of the said application are incorporated by reference into this application.

[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 battery types 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 battery pack.

[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] However, when multiple battery modules are included within a battery pack, they can be vulnerable to thermal chain reactions between the modules. For example, if an event such as thermal runaway occurs within a single battery module, this thermal runaway can propagate to other battery modules. If the propagation of thermal runaway between battery modules is not adequately controlled, an event occurring in a specific battery module can trigger a chain reaction across multiple battery modules, potentially resulting in major problems such as explosions or fires.

[0007] In particular, if an event such as thermal runaway occurs in a single battery module, venting gases, etc. may be released outside the battery module. In this case, heat may be transferred to other battery modules by the venting gases, potentially triggering a thermal chain reaction in other battery modules.

[0008] Therefore, when an event such as thermal runaway occurs in a battery pack, there is a need to develop a structure that can prevent or suppress the propagation of thermal runaway between battery cells and / or battery modules by minimizing the thermal energy received by adjacent battery modules.

[0009] Accordingly, the problem to be solved by the present invention is to provide a battery pack that can prevent or suppress the propagation of thermal runaway between battery modules by minimizing the thermal energy received by adjacent battery cells and / or battery modules when thermal runaway occurs in a battery module.

[0010] 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.

[0011] To solve the above problem, the present invention provides a battery pack comprising: a pack case configured to accommodate a plurality of battery cells; and a first venting channel formed corresponding to at least some of the plurality of battery cells and configured to allow venting gas generated in the battery cells to flow inward in a recessed shape on the inner side thereof.

[0012] The first venting channel may be configured to extend along the longitudinal direction of the battery cell.

[0013] The first venting channel may be provided in multiple numbers and arranged along the stacking direction of the battery cells.

[0014] The above first venting channel may be provided at the bottom of the plurality of battery cells.

[0015] The above pack case may be provided at the bottom of the plurality of battery cells so that a cooling channel configured to allow a cooling medium to flow may be formed.

[0016] The above cooling channel may be located below the first venting channel.

[0017] A battery pack according to one embodiment of the present invention may further include a module case that accommodates the plurality of battery cells and is configured such that a bottom surface is at least partially open.

[0018] A battery pack according to one embodiment of the present invention may further include cooling fins provided between some of the plurality of battery cells.

[0019] The cooling fins may be configured such that their ends are inserted into the side of the pack case where the first venting channel is formed.

[0020] The cooling fins may be configured such that their ends are interposed between the first venting channels.

[0021] The pack case may have a hollow structure formed on the inside, connected to the first venting channel, and a second venting channel configured to communicate with the outside of the pack case.

[0022] The pack case is configured to accommodate the plurality of battery cells, and may include a base frame in which the first venting channel is formed in an internal space, and a side frame extending upward from a corner of the base frame and in which the second venting channel is formed in an internal space.

[0023] The above pack case may be formed with a communication hole configured to communicate the first venting channel and the second venting channel with each other.

[0024] The pack case is configured to group the plurality of battery cells, and may have a cross beam formed in the internal space with a third venting channel configured to communicate with the first venting channel and the second venting channel.

[0025] The above pack case may be provided with a venting device configured to communicate with the second venting channel and discharge the venting gas of the second venting channel to the outside.

[0026] And, the present invention provides an automobile characterized by including a battery pack according to the present invention.

[0027] According to one aspect of the present invention, the flow of fluids, such as venting gas, toward adjacent battery cells and / or battery modules can be minimized. This prevents or suppresses thermal runaway propagation between battery cells and / or battery modules, thereby ensuring the safety and reliability of the battery pack.

[0028] Moreover, according to another aspect of the present invention, safe venting performance of the battery pack can be secured by quickly discharging venting gas generated in the battery module to the outside of the battery pack.

[0029] In addition, according to another aspect of the present invention, efficient cooling performance of the battery pack can be secured by directly cooling the battery cells with a cooling medium.

[0030] In addition, according to another aspect of the present invention, events resulting from thermal runaway of a device equipped with a battery pack, such as fire or explosion, can be prevented or delayed.

[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 an internal perspective view of a battery pack according to one embodiment of the present invention, and is a drawing for explaining a first venting channel.

[0036] 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. 1.

[0037] FIG. 5 is a bottom perspective view of a battery module included in a battery pack according to one embodiment of the present invention.

[0038] FIG. 6 is a perspective view of a battery cell included in a battery pack according to one embodiment of the present invention.

[0039] Figure 7 is an enlarged view of part A of Figure 4.

[0040] FIG. 8 is a cross-sectional view of a battery pack with cooling fins applied according to one embodiment of the present invention.

[0041] FIG. 9 is a cross-sectional view of a battery pack with cooling fins applied according to another 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. 11 may be a drawing showing a cross-section taken along line II-II' of Fig. 1.

[0043] FIG. 11 is an enlarged perspective view of a battery pack according to one embodiment of the present invention, and is a drawing for explaining a communication hole.

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

[0045] Fig. 13 is a cross-sectional view of a battery pack according to one embodiment of the present invention, viewed from above. 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 an internal perspective view of a battery pack according to one embodiment of the present invention, which is a drawing for explaining a first venting channel.

[0054] Referring to FIGS. 1 to 3, a battery pack (1) according to one embodiment of the present invention may include a battery cell (100) and a pack case (200).

[0055] First, referring primarily to FIG. 2, a plurality of battery cells (100) may be included. Although not illustrated in the drawing, the plurality of battery cells (100) may include an electrode assembly, a cell case accommodating the electrode assembly, and electrode leads connected to the electrode assembly and extending outward from the cell case to function as electrode terminals. In this case, the plurality of battery cells (100) may be electrically connected to each other.

[0056] A plurality of battery cells (100) may be stacked in at least one direction. For example, as illustrated in FIG. 2, a plurality of battery cells (100) may be arranged in a vertical direction (Z-axis direction) and in a parallel manner in the front-back direction (X-axis direction).

[0057] 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).

[0058] The pack case (200) may be configured to accommodate a plurality of battery cells (100). The pack case (200) may be provided in a box shape including a plurality of frames. 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.

[0059] Additionally, a first venting channel (V1) may be formed in the pack case (200). The first venting channel (V1) may refer to a passage through which venting gas or the like flows. The first venting channel (V1) may be configured to allow venting gas generated in the battery cell (100) to flow therethrough. The first venting channel (V1) may be configured to extend in at least one direction. Additionally, the first venting channel (V1) may be configured in a partially sunken shape.

[0060] The first venting channel (V1) may be configured in a form that is sunken inward from the inner surface of the pack case (200). More specifically, a plurality of ribs (R) may be formed in the pack case (200), and the first venting channel (V1) may be formed by the plurality of ribs (R) that are spaced apart from each other. That is, the first venting channel (V1) may be defined as a space between two adjacent ribs (R), and may provide a predetermined space through which a venting gas flows. At this time, the ribs (R) may be configured to extend long in at least one direction.

[0061] According to the above-described embodiment of the present invention, venting gas, etc. generated in the battery cell (100) can be directly introduced into the first venting channel (V1) and flow. In this way, the battery pack (1) according to the present invention can discharge the venting gas in a specific direction rather than all directions when a thermal event occurs in a certain battery cell (100) and high-temperature gas or flames are generated. Accordingly, since the high-temperature gas or flames, etc. can be quickly discharged to the outside of the battery pack (1) through the first venting channel (V1), heat transfer to other battery cells (100) can be minimized.

[0062] In addition, when gas is generally emitted from a battery cell (100), pieces of electrode plates or active materials inside the battery cell (100) may be emitted to the outside in a high-temperature state, and these high-temperature particles may appear in the form of sparks. The battery pack (1) according to the present invention prevents high-temperature particles from easily escaping directly to the outside of the battery pack (1) even when they are emitted from the battery cell (100), and allows them to escape by sufficiently lowering the temperature while moving through the space between the ribs (R), thereby preventing them from acting as a source of ignition outside the battery pack (1).

[0063] In addition, the first venting channel (V1) may be provided corresponding to at least some of the plurality of battery cells (100). The first venting channel (V1) may be configured to be individually connected to at least some of the plurality of battery cells (100). This prevents venting gas discharged from any battery cell (100) from moving beyond the rib (R) to another first venting channel (V1).

[0064] According to the above-described embodiment of the present invention, the venting gas is prevented from flowing toward other battery cells (100) by the first venting channel (V1) provided for each battery cell (100), thereby minimizing thermal damage to the other battery cells (100). Accordingly, the propagation of thermal runaway within the battery pack (1) is prevented or suppressed, thereby ensuring the safety and reliability of the battery pack (1).

[0065]

[0066] Meanwhile, referring to FIGS. 1 and 2, the pack case (200) may include a base frame (210) and a plurality of side frames (220).

[0067] The base frame (210) may be configured to accommodate a plurality of battery cells (100). 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 provided with a flat upper surface so that the battery cells (100) or battery modules (10) may be stably accommodated.

[0068] A plurality of side frames (220) may be provided to extend upward from each corner of the base frame (210). The plurality of side frames (220) may be provided to surround a plurality of battery cells (100). More specifically, the plurality of side frames (220) may be provided as a right wall located at the +X direction side end of the base frame (210), a rear wall located at the +Y direction side end, a left wall located at the -X direction side end, and a front wall located at the -Y direction side end, respectively, to form a side surface of the pack case (200).

[0069] Additionally, the pack case (200) may include a cross beam (230). The cross beam (230) may be configured to partition the internal space of the pack case (200). The cross beam (230) may be configured to partition a plurality of battery cells (100) or a plurality of battery modules (10). The cross beam (230) may be configured to extend along the left-right direction and / or the front-back direction of the pack case (200).

[0070] A plurality of cross beams (230) may be provided. The cross beams (230) may be provided to connect the side frames (220) facing each other among a plurality of side frames (220). For example, as illustrated in FIG. 2, a plurality of battery cell (100) stacks may be arranged in four rows and two columns by the cross beams (230).

[0071] Meanwhile, the pack case (200) may further include a cover frame (240). The cover frame (240) may be configured to cover the upper portions of the plurality of battery cells (100). The cover frame (240) may be provided to form the upper surface of the pack case (200). The cover frame (240) may be coupled to the side frame (220). Alternatively, the cover frame (240) may be provided integrally with the side frame (220).

[0072]

[0073] Hereinafter, the configuration of the pack case (200) including the first venting channel (V1) will be described in more detail with reference to FIGS. 1 to 3.

[0074] Referring to FIG. 3, the first venting channel (V1) may be configured to extend along the longitudinal direction of the battery cell (100). The first venting channel (V1) may be configured in a straight shape. In particular, the battery cell (100) is provided in a pouch shape, and the length of the first venting channel (V1) may be configured to correspond to the length of the battery cell (100).

[0075] These ribs (R) and the first venting channel (V1) can be formed as the pack case (200) is extruded. As the pack case (200) is extruded, the ribs (R) can be formed to extend in one direction (X-axis direction) along the extrusion direction of the pack case (200). According to the above-described exemplary configuration of the present invention, since the ribs (R) are integrally provided in the pack case (200), a process of joining the ribs (R) to the pack case (200) is unnecessary, and since there is no defect at the joining portion, the possibility of the venting gas spreading to another first venting channel (V1) can be further reduced.

[0076] Additionally, a plurality of first venting channels (V1) may be provided. These plurality of first venting channels (V1) may be arranged along the stacking direction of the battery cells (100). Additionally, the plurality of first venting channels (V1) may be arranged parallel to each other.

[0077] According to the above-described embodiment of the present invention, since the first venting channels (V1) extending in one direction are spaced apart from each other along the stacking direction of the battery cells (100), when a thermal event occurs in a certain battery cell (100), the venting gas flowing into the first venting channel (V1) can be further suppressed from flowing over the rib (R) to another first venting channel (V1). In addition, the venting gas flowing in the first venting channel (V1) can be prevented from spreading in all directions, and can quickly move to the outside along the extension direction of the first venting channel (V1).

[0078]

[0079] 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. 1.

[0080] In particular, referring to FIG. 4, the first venting channel (V1) may be provided at the bottom of the plurality of battery cells (100). That is, the rib (R) and the first venting channel (V1) may be formed on the bottom surface of the pack case (200), i.e., the base frame (210). The plurality of battery cells (100) may be configured to be seated on the rib (R). That is, the plurality of battery cells (100) may be accommodated inside the pack case (200) while being supported by the rib (R).

[0081] Accordingly, when a thermal event occurs in the battery cell (100), the venting gas or the like can move directly to the first venting channel (V1) located at the bottom. According to the above-described embodiment of the present invention, when high-temperature gas or flames are discharged from the battery cell (100) in a situation such as thermal runaway, the discharged gas or flames may not be directed upward. In particular, according to one embodiment of the present invention, when a passenger is located at the upper side of the battery pack (1), such as in an electric vehicle, by performing directional venting downwards of the battery pack (1), the gas or flames or the like can be suppressed or delayed from moving toward the passenger. As a result, the safety of the battery pack (1) and the device including the battery pack (1) can be enhanced.

[0082]

[0083] Meanwhile, a cooling channel (C) may be formed in the pack case (200). The cooling channel (C) may refer to a passage configured to allow a cooling medium such as coolant to flow. The cooling channel (C) may be formed in the internal space of the pack case (200). Here, the internal space of the pack case (200) may refer to a predetermined space separately provided inside the pack case (200), or may refer to a hollow space formed in a plurality of beams or frames forming the pack case (200).

[0084] In particular, the cooling channel (C) may be provided at the bottom of a plurality of battery cells (100). That is, the cooling channel (C) may be provided in the base frame (210). For example, a hollow space may be formed within the base frame (210) so that a cooling medium may flow through the hollow space. Alternatively, the cooling channel (C) may be configured in the form of a pipe within the internal space of the base frame (210).

[0085] According to the above-described embodiment of the present invention, since the bottom surface of the battery cell (100) or the battery module (10) can be cooled, heat energy accumulation in the battery cell (100) can be minimized. In particular, the cooling performance of the battery pack (1) can be secured by minimizing heat generation in the battery cell (100) due to the charge / discharge cycle in the normal state of the battery pack (1).

[0086] The cooling channel (C) may be provided on at least one side of the first venting channel (V1). In addition, the first venting channel (V1) and the cooling channel (C) may be configured to face each other. The cooling channel (C) may be provided parallel to the first venting channel (V1). The first venting channel (V1) may extend in one direction, and the cooling channel (C) may extend along one direction in which the first venting channel (V1) extends. That is, the cooling channel (C) may be arranged parallel to the first venting channel (V1). Accordingly, the venting gas or the like within the first venting channel (V1) may be configured to contact the cooling channel (C).

[0087] For example, although not shown in the drawing, the cooling channel (C) may be arranged to overlap the first venting channel (V1) in the horizontal direction. In this case, the cooling channel (C) may be provided between a plurality of first venting channels (V1). Alternatively, as in the embodiment illustrated in FIG. 4, the cooling channel (C) may be arranged to overlap the first venting channel (V1) in the vertical direction.

[0088] According to the above-described embodiment of the present invention, when thermal runaway occurs in the battery cell (100), heat such as venting gas or flame inside the first venting channel (V1) can be more efficiently cooled by the cooling medium of the cooling channel (C).

[0089] Moreover, the cooling channel (C) may be provided outside the first venting channel (V1). That is, it may mean that the cooling channel (C) is provided outside the first venting channel (V1) with respect to a certain battery cell (100). For example, as in the embodiment illustrated in FIG. 4, the first venting channel (V1) may be located at the bottom of the battery cell (100), and the cooling channel (C) may be located at the bottom of the first venting channel (V1).

[0090] According to the above-described embodiment of the present invention, since the first venting channel (V1) is arranged between the battery cell (100) and the cooling channel (C), the venting gas or flame, etc. generated in the battery cell (100) can quickly move to the first venting channel (V1) and simultaneously be cooled by the cooling medium within the cooling channel (C). That is, according to the above-described embodiment of the present invention, the heat of the venting gas, etc. discharged can be controlled more efficiently. As a result, the cooling performance of the battery pack (1) can be secured.

[0091] A cooling channel (C) may be provided at the lower portion of each first venting channel (V1). That is, the cooling channel (C) may be arranged to vertically overlap with the first venting channel (V1). According to the above-described embodiment of the present invention, since the cooling channel (C) is provided for each first venting channel (V1), the first venting channel (V1) provided on the side of the battery cell (100) where a thermal event occurs can be individually cooled. Accordingly, the cooling efficiency of the battery pack (1) can be improved.

[0092]

[0093] FIG. 5 is a bottom perspective view of a battery module included in a battery pack according to one embodiment of the present invention.

[0094] Meanwhile, referring to FIGS. 2 and 5, a plurality of battery cells (100) can be modularized into one or more battery modules (10). That is, the battery pack (1) according to the present invention includes a plurality of battery modules (10), and the plurality of battery cells (100) included in the battery pack (1) can be divided and included in a plurality of battery modules (10). At this time, the plurality of battery cells (100) included in the battery module (10) can be electrically connected to each other.

[0095] 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 and accommodate at least some of a plurality of battery cells (100) in the internal space. In particular, the module case (11) may be configured to accommodate the battery cells (100). That is, the module case (11) groups a plurality of battery cells (100) into a plurality of battery modules (10) and may serve as a boundary that physically limits the internal space of each battery module (10).

[0096] 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.

[0097] Furthermore, the battery module (10) according to one embodiment of the present invention may be configured such that the bottom surface of the module case (11) is at least partially open. For example, although not shown in the drawing, a venting hole may be formed in the bottom surface of the module case (11). The venting hole may be formed by penetrating the bottom surface of the module case (11). The venting hole may be configured such that gas generated from a battery cell (100) housed inside the module case (11) is discharged to the outside of the module case (11).

[0098] Alternatively, as in the embodiment illustrated in FIG. 5, the bottom surface of the module case (11) may be configured to be entirely open. Accordingly, the module case (11) may be configured to cover five of the six sides of the plurality of battery cells (100), excluding the bottom surface. In this case, the module case (11) may be configured in an n-shape.

[0099] According to the above-described embodiment of the present invention, venting gas or flames generated from the battery cell (100) inside the module case (11) can be directly introduced into the first venting channel (V1) provided at the bottom. Accordingly, venting gas or the like generated from the battery module (10) can be quickly discharged to the outside of the battery pack (1), thereby ensuring safe venting performance of the battery pack (1).

[0100] In addition, according to the above-described embodiment of the present invention, since the bottom surface of the module case (11) does not exist, it can directly face the battery cell (100) and the cooling channel (C). Accordingly, the cooling medium within the cooling channel (C) can directly cool the battery cell (100), thereby ensuring efficient cooling performance of the battery pack (1).

[0101] Meanwhile, referring back to FIG. 2, the first venting channel (V1) may be provided in each receiving space of the pack case (200) in which the battery module (10) is installed. That is, the first venting channels (V1) provided in each receiving space may be configured not to be connected to each other.

[0102] According to the above-described embodiment of the present invention, when a thermal event occurs in a battery module (10), venting gas or the like can be prevented from moving to an adjacent battery module (10) through the first venting channel (V1). As a result, the performance of preventing heat transmission between battery modules (10) can be improved.

[0103]

[0104] FIG. 6 is a perspective view of a battery cell included in a battery pack according to one embodiment of the present invention, and FIG. 7 is an enlarged view of part A of FIG. 4.

[0105] Meanwhile, according to one embodiment of the present invention, the battery cell (100) may be a pouch-type secondary battery. The cell case (110) 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.

[0106] For example, a battery cell (100) according to one embodiment of the present invention may be a roughly rectangular plate-shaped cell having a long side in the direction along the X-axis of FIG. 6, a short side in the direction along the Z-axis, and a thickness smaller than the length of the X-axis or Z-axis "sleeve*" in the Y-axis direction of FIG. 6. At this time, an electrode lead (120) may be formed on the short side of the battery cell (100) (the Y-axis direction of FIG. 6).

[0107] The cell case (110) of the battery cell (100) can accommodate the electrode assembly in the receiving portion (111), and the edge around the receiving portion (111) can be heat-sealed to form a sealing portion (112). The sealing portion (112) can be provided on three of the four sides of the battery cell (100). For example, in each battery cell (100), the sealing portion (112) can face the front-back direction (X-axis direction in FIG. 6) and the lower direction (-Z-axis direction) of the battery cell (100) except for the upper direction in which the sheet is folded, and the receiving portion (111) can face the left-right direction (Y-axis direction).

[0108] In addition, the battery cell (100) may include a folding portion (113) that is provided to be folded on one side of the sealing portion (112) where the electrode lead (120) does not protrude. That is, the folding portion (113) may be included on the side of the sealing portion (112) where the electrode lead (120) is not provided.

[0109] Multiple battery cells (100) can be arranged in parallel along the Y-axis while standing vertically (Z-axis direction). Accordingly, by stacking multiple battery cells (100) face-to-face, the structure can be efficient for increasing energy density. Furthermore, by arranging the battery cells (100) in this manner, it is easy to control the venting direction to one side.

[0110] In particular, as illustrated in FIG. 7, the battery cell (100) may be provided in an upright position with the folding portion (113) facing downward. According to the above-described embodiment of the present invention, venting can be induced downward where the folding portion (113) is located. Accordingly, when the battery cell (100) is vented, the venting gas can quickly move to the first venting channel (V1) located at the bottom of the battery cell (100).

[0111] Meanwhile, referring to FIG. 7, when the battery cell (100) of the present invention is provided as a pouch-type battery cell, the first venting channel (V1) may be provided for every two battery cells (100), and the two battery cells (100) may be configured to face each other. That is, the folding parts (113) of the two battery cells (100) may also be configured to face each other. At this time, the folding part (113) may be provided in the first venting channel (V1). For example, as in the embodiment illustrated in FIG. 7, the folding part (113) may be configured to be accommodated inside the first venting channel (V1). Alternatively, the folding part (113) may be configured to be bent toward the first venting channel (V1) and to be unfolded when the internal pressure of the battery cell (100) increases so as to be positioned inside the first venting channel (V1).

[0112] According to the above-described embodiment of the present invention, when the internal pressure of the battery cell (100) increases, the folding portion (113) unfolds and the discharged venting gas can be directly discharged into the first venting channel (V1). That is, according to the above-described embodiment of the present invention, the high-temperature gas discharged downward through the venting structure of the battery cell (100) can be quickly discharged into the first venting channel (V1).

[0113] Meanwhile, although the embodiment of FIG. 7 illustrates the folding portion (113) facing downward, unlike the above embodiment, the battery cell (100) may be arranged such that the folding portion (113) faces upward. In this case, the side of the battery cell (100) without the folding portion (113) can directly face the cooling channel (C). Accordingly, the cooling medium within the cooling channel (C) can directly cool the battery cell (100), thereby ensuring efficient cooling performance of the battery pack (1).

[0114]

[0115] FIG. 8 is a cross-sectional view of a battery pack with cooling fins applied according to one embodiment of the present invention.

[0116] Referring to FIG. 8, a battery pack (1) according to an embodiment of the present invention may further include cooling fins (300). The cooling fins (300) may be provided between some of the battery cells (100) among the plurality of battery cells (100). In particular, the cooling fins (300) may be configured to partition the space between the plurality of battery cells (100). The cooling fins (300) may be configured to group the plurality of battery cells (100). For example, as illustrated in FIG. 8, cooling fins (300) may be arranged between every two battery cells (100), thereby grouping the battery cells (100) in groups of two.

[0117] At least one cooling fin (300) may be included in one battery module (10). The cooling fin (300) may be provided in the internal space of the module case (11).

[0118] A plurality of cooling fins (300) may be provided along one direction in which the battery cells (100) are arranged. The plurality of cooling fins (300) may be arranged along the stacking direction of the battery cells (100). In addition, the cooling fins (300) may be configured to extend along the longitudinal direction of the battery cells (100).

[0119] These cooling fins (300) may be configured to cool heat generated when a thermal event occurs in the battery cell (100). The cooling fins (300) may be provided in contact with the battery cell (100). Accordingly, when heat is generated in the battery cell (100), the heat may be removed by the cooling fins (300) and cooled.

[0120] To this end, the cooling fin (300) may be formed of a material with excellent cooling performance. Furthermore, the cooling fin (300) may be configured to maintain a sealed structure without deformation even under high temperatures and pressures. The cooling fin (300) may be formed of a pad thinner than the battery cell (100). For example, the cooling fin (300) may be formed of a material such as insulated SUS or aluminum.

[0121] According to the above-described embodiment of the present invention, even if a thermal event occurs in any battery cell (100) that is provided in contact with the cooling fin (300), the heat of the battery cell (100) is quickly cooled by the cooling fin (300), so that the cooling efficiency of the battery pack (1) can be maximized.

[0122] Meanwhile, the cooling fins (300) may be provided to extend upwards further than the battery cells (100). That is, the vertical height of the cooling fins (300) may be provided to be longer than the vertical height of the battery cells (100). Furthermore, the cooling fins (300) may be configured such that their upper ends come into contact with the inner surface of the module case (11).

[0123] According to the above-described embodiment of the present invention, the gap between the cooling fin (300) and the module case (11) is minimized by the cooling fin (300), so that the space in which the venting gas can flow inside the module case (11) is reduced, and thus the movement of the venting gas, etc. can be blocked.

[0124] Accordingly, even if a thermal event occurs in a battery cell (100), the movement of venting gas, flames, and / or particles to other groups of battery cells (100) can be suppressed. The propagation of thermal runaway between battery cells (100) can be effectively prevented or delayed. Accordingly, the safety and reliability of the battery module (10) can be guaranteed.

[0125]

[0126] FIG. 9 is a cross-sectional view of a battery pack with cooling fins applied according to another embodiment of the present invention.

[0127] As another embodiment, in order to improve the fixing force between the pack case (200) and the cooling fin (300), the cooling fin (300) may be configured such that its end is inserted into the pack case (200). In particular, the cooling fin (300) may be configured such that its end is inserted into the side surface where the first venting channel (V1) of the pack case (200) is formed. For example, the lower end of the cooling fin (300) may be configured such that it is inserted into a rib (R) formed in the base frame (210). The cooling fin (300) may be configured such that it penetrates the outside of the module case (11) and its end is inserted into the base frame (210).

[0128] More specifically, referring to FIG. 9, the pack case (200) may be provided with a fixing groove (G) formed by at least a portion being sunken inward. The fixing groove (G) may be formed in a rib (R). The cooling fin (300) may be inserted into and provided in this fixing groove (G). Accordingly, the lower end of the cooling fin (300) may be provided in close contact with the fixing groove (G) without a gap.

[0129] According to the above-described embodiment of the present invention, since the cooling fin (300) can be inserted into the pack case (200) and supported on both sides, the fixing force between the cooling fin (300) and the pack case (200) can be further improved. Furthermore, according to the above-described embodiment of the present invention, the possibility that the cooling fin (300) will be pushed out by high-temperature, high-pressure venting gas or flame, or that the cooling fin (300) will be bent and deformed by the internal pressure of the venting gas, thereby separating the battery cell (100) and the cooling fin (300) can be reduced. As a result, the arrangement of the battery cell (100) and the cooling fin (300) can be stably maintained, thereby improving the cooling performance.

[0130] In addition, the sealing force between the end portion of the cooling fin (300) and the pack case (200) can be stably secured. Therefore, according to the above-described implementation configuration, the separation between the plurality of battery cells (100) can be more reliably achieved, and the heat transmission prevention performance between the battery cells (100) can be further improved.

[0131] Furthermore, as in the embodiment illustrated in FIG. 9, the cooling fin (300) may be configured such that its end is interposed between the first venting channels (V1). Furthermore, the cooling fin (300) may be configured such that its end is interposed between the cooling channels (C).

[0132] According to the above-described embodiment of the present invention, the venting gas and the like within the first venting channel (V1) can be cooled not only by the cooling channel (C) but also by the cooling fins (300). Accordingly, the cooling efficiency of the battery pack (1) can be further improved.

[0133] In addition, according to the above-described embodiment of the present invention, the ends of the cooling fins (300) can be configured to define a plurality of first venting channels (V1). As a result, the plurality of first venting channels (V1) can be more securely separated from each other, thereby further improving the heat transfer prevention performance between battery cells (100).

[0134]

[0135] Fig. 10 is a cross-sectional view of a battery pack according to one embodiment of the present invention. For example, Fig. 11 may be a drawing illustrating a cross-section taken along line II-II' of Fig. 1. In addition, Fig. 11 is an enlarged perspective view of a battery pack according to one embodiment of the present invention, and is a drawing for explaining a communication hole.

[0136] Meanwhile, the pack case (200) may be formed with a second venting channel (V2). The second venting channel (V2) may be provided in a hollow structure inside the pack case (200). That is, the second venting channel (V2) may be defined as a hollow structure formed in any one of the frames of the pack case (200). The second venting channel (V2) may be configured to be connected to the first venting channel (V1). In addition, the second venting channel (V2) may be configured to be connected to the outside of the pack case (200).

[0137] As a more specific example, as in the embodiment illustrated in FIGS. 10 and 11, the first venting channel (V1) may be formed in the internal space of the base frame (210), and the second venting channel (V2) may be formed in the internal space of the side frame (220). The second venting channel (V2) may be formed in all four walls of the side frame (220).

[0138] Accordingly, as indicated by the bold arrow in Fig. 10, the venting gas generated from the battery cell (100) may move to the first venting channel (V1) formed in the base frame (210) and then to the second venting channel (V2) formed in the side frame (220). This venting gas may be discharged to the outside of the pack case (200).

[0139] In order to connect the first venting channel (V1) and the second venting channel (V2), the pack case (200) may be formed with a communication hole (H). The communication hole (H) may be configured to communicate the first venting channel (V1) and the second venting channel (V2) with each other. In the embodiment illustrated in FIGS. 10 and 11 , the communication hole (H) may be provided between the first venting channel (V1) and the second venting channel (V2). That is, the communication hole (H) may be provided between the base frame (210) and the side frame (220).

[0140] Referring to Fig. 11, a communication hole (H) may be provided on the inner surface of the side frame (220). The communication hole (H) may be provided on the surface of the side frame (220) facing the battery cell (100) or the battery module (10). The communication hole (H) may be provided closer to the base frame (210) of the side frame (220). The communication hole (H) may be formed by being surrounded by two adjacent ribs (R) and the side frame (220).

[0141] A plurality of communication holes (H) may be provided. For example, a plurality of communication holes (H) may be provided along the arrangement direction of the first venting channel (V1). Furthermore, a plurality of communication holes (H) may be individually provided for each first venting channel (V1). In other words, a plurality of communication holes (H) may be provided to correspond one-to-one with a plurality of the first venting channels (V1). A communication hole (H) may be provided at each portion where a plurality of first venting channels (V1) are connected to the side frame (220).

[0142] According to the above-described embodiment of the present invention, venting gas generated from a single battery cell (100) can flow into a first venting channel (V1) connected to the battery cell (100) and move to a second venting channel (V2) through a communication hole (H) connected to the first venting channel (V1). Accordingly, the possibility of the venting gas spreading to another first venting channel (V1) is extremely low due to the rib (R) defining the first venting channel (V1).

[0143]

[0144] Fig. 12 is a cross-sectional view of a battery pack according to one embodiment of the present invention. For example, Fig. 12 may be a cross-sectional view taken along line I-I' of Fig. 1. Furthermore, Fig. 13 is a cross-sectional view taken along line III-III' of Fig. 1, as viewed from above, of a battery pack according to one embodiment of the present invention. For example, Fig. 13 may be a cross-sectional view taken along line III-III' of Fig. 1.

[0145] The pack case (200) may be formed with a third venting channel (V3). The third venting channel (V3) may be provided as a hollow structure inside the pack case (200). That is, the third venting channel (V3) may be defined as a hollow structure formed in any one of the frames of the pack case (200). The third venting channel (V3) may be configured to communicate with the first venting channel (V1) and the second venting channel (V2). As a more specific example, as in the embodiment illustrated in FIGS. 12 and 13, the third venting channel (V3) may be formed in the internal space of the cross beam (230).

[0146] Accordingly, as shown by the bold arrow in FIG. 13, the venting gas generated from the battery cell (100) can move to the first venting channel (V1) formed in the base frame (210), and then move to the second venting channel (V2) formed in the side frame (220) as well as the third venting channel (V3) formed in the cross beam (230).

[0147] According to the above-described embodiment of the present invention, venting gas, etc. discharged from a battery cell (100) or battery module (10) in contact with a cross beam (230) can move directly to the third venting channel (V3) formed in the cross beam (230), so that the venting gas, etc. can be discharged more quickly to the outside of the pack case (200).

[0148] At this time, the communication hole (H) may be configured to communicate the first venting channel (V1) and the second venting channel (V2) with each other. The communication hole (H) may be provided between the first venting channel (V1) and the third venting channel (V3). That is, the communication hole (H) may be provided between the base frame (210) and the cross beam (230). That is, the communication hole (H) may be provided on both sides in the longitudinal direction of the first venting channel (V1). In addition, the communication hole (H) may be provided on the outer surface of the cross beam (230).

[0149] According to the above-described embodiment of the present invention, venting gas generated from a battery cell (100) can flow into a first venting channel (V1) connected to the battery cell (100) and move to a third venting channel (V3) through a communication hole (H) connected to the first venting channel (V1).

[0150] Meanwhile, referring to FIGS. 12 and 13, the pack case (200) may include a venting device (250).

[0151] The venting device (250) may be configured to discharge gas generated from the battery cell (100) to the outside of the pack case (200). When venting gas is generated inside the pack case (200) and the internal pressure increases, the venting device (250) may be configured to open due to the pressure of the venting gas and discharge the venting gas to the outside of the pack case (200).

[0152] The venting device (250) may be configured to open and close depending on the internal pressure within the pack case (200). Alternatively, the venting device (250) may be configured in the form of a hole. Meanwhile, the present invention is not limited by the specific type or shape of the venting device (250), and various venting devices (250) known at the time of filing of the present invention may be employed to configure the battery pack (1) of the present invention.

[0153] Specifically, the venting device (250) may be provided on the side of the pack case (200), i.e., the side frame (220). A plurality of venting devices (250) may be provided. The venting device (250) may be provided on at least one side frame (220) among a plurality of side frames (220). The venting device (250) may be separately formed on two or more side frames (220), or two or more may be formed on one side frame (220).

[0154] Meanwhile, the number or location of the venting device (250) described based on the embodiment of Fig. 13 is merely an example, and it is obvious that the number or location may be changed to various other numbers or locations.

[0155] The venting device (250) may be provided to communicate with a second venting channel (V2) formed in the side frame (220). As a result, the venting gas of the second venting channel (V2) may be configured to be discharged to the outside of the pack case (200) through the venting device (250).

[0156] Referring to FIG. 13, the direction in which the venting gas is discharged when a high-temperature venting gas or flame is generated in a battery cell (100) will be described in detail. The venting gas flows into the first venting channel (V1) located at the bottom of the battery cell (100), and the venting gas flowing through the first venting channel (V1) can flow into the second venting channel (V2) and / or the third venting channel (V3) through the communication holes (H) provided on both sides (see the bold arrows in FIG. 13). Thereafter, the venting gas flowing through the third venting channel (V3) can move to the second venting channel (V2). This venting gas can be discharged to the outside of the pack case (200) through the venting device (250) communicating with the second venting channel (V2).

[0157] According to the above-described embodiment of the present invention, since the venting gas and the like can move directly to the second venting channel (V2) of the side frame (220) in which the venting device (250) is provided, the venting gas and the like can be quickly discharged to the outside of the pack case (200).

[0158]

[0159] FIG. 14 is a schematic perspective view of a vehicle including a battery pack according to one embodiment of the present invention.

[0160] Referring to FIG. 14, a vehicle (V) according to an embodiment of the present invention may include one or more battery packs (1) according to an embodiment of the present invention. The vehicle (V) according to the present invention may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The vehicle (V) may include a four-wheel vehicle and a two-wheel vehicle. The vehicle (V) may operate by receiving power from a battery pack (1) according to an embodiment of the present invention.

[0161]

[0162] 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; and A battery pack characterized by comprising a pack case configured to accommodate the plurality of battery cells, and having a first venting channel formed corresponding to at least some of the plurality of battery cells and configured to allow venting gas generated from the battery cells to flow inward in a recessed shape on the inner side.

2. In paragraph 1, A battery pack, characterized in that the first venting channel is configured to extend along the longitudinal direction of the battery cell.

3. In paragraph 1, A battery pack characterized in that the first venting channels are provided in plurality and arranged along the stacking direction of the battery cells.

4. In paragraph 1, A battery pack, characterized in that the first venting channel is provided at the bottom of the plurality of battery cells.

5. In paragraph 1, A battery pack characterized in that the pack case is provided at the bottom of the plurality of battery cells and has a cooling channel formed therein so that a cooling medium flows.

6. In paragraph 5, A battery pack, characterized in that the cooling channel is located at the lower portion of the first venting channel.

7. In paragraph 1, A battery pack characterized in that it further includes a module case that accommodates the plurality of battery cells and is configured such that a bottom surface is at least partially open.

8. In paragraph 1, A battery pack further comprising cooling fins provided between some of the plurality of battery cells.

9. In paragraph 8, A battery pack characterized in that the cooling fin is configured such that its end is inserted into the side of the pack case where the first venting channel is formed.

10. In paragraph 8, A battery pack characterized in that the cooling fins are configured such that their ends are interposed between the first venting channels.

11. In paragraph 1, The above pack case is A battery pack characterized in that a second venting channel is formed, which is provided with a hollow structure inside, is connected to the first venting channel, and is configured to communicate with the outside of the pack case.

12. In paragraph 11, The above pack case is A base frame configured to accommodate the plurality of battery cells and having the first venting channel formed in the internal space; A battery pack characterized by having a side frame extending upward from a corner of the base frame and having the second venting channel formed in the internal space.

13. In paragraph 11, The above pack case is A battery pack characterized in that a communication hole is formed so as to connect the first venting channel and the second venting channel to each other.

14. In paragraph 11, The above pack case is A battery pack characterized in that it comprises a cross beam configured to group the plurality of battery cells and having a third venting channel formed in an internal space so as to be in communication with the first venting channel and the second venting channel.

15. In paragraph 11, The above pack case is A battery pack characterized by having a venting device configured to communicate with the second venting channel and discharge venting gas of the second venting channel to the outside.

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

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