Battery module, and battery pack and vehicle including same

Abstract

The present invention relates to a battery module comprising: a plurality of battery cells; a module case configured to accommodate the plurality of battery cells and having a first venting hole configured to be formed on one side surface thereof to discharge, to the outside, venting gas generated from the battery cells; and a compression member configured between the plurality of battery cells and one side surface of the module case to block fluid movement between at least two battery cells.

Description

Battery modules, battery packs containing the same, and vehicles

[0001] The present invention relates to a battery module, a battery pack including the same, and a vehicle. Specifically, the present invention relates to a battery module capable of suppressing heat transmission within the battery module, a battery pack including the same, and a vehicle.

[0002] This application claims priority to Korean Patent Application No. 10-2024-0059300, filed on May 3, 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] Meanwhile, since battery cells undergo chemical reactions during charging and discharging, their performance can deteriorate if used in environments above their optimal temperature. Furthermore, if thermal control fails to maintain optimal temperatures, there's a constant risk of unexpected fire or explosion. Furthermore, battery modules are structured to house these cells tightly within the module housing. Therefore, if a thermal event occurs in a single battery cell, the resulting high-temperature gases or flames can spread to adjacent cells, potentially triggering a chain reaction of battery cell explosions, posing a significant risk.

[0006] In particular, in conventional battery modules, high-temperature gases and flames vented from the top of the battery cells and migrated to adjacent battery cells through the empty space formed between the battery cells and the top plate. Consequently, heat transfer within the battery module was further accelerated.

[0007] Therefore, even if a thermal event occurs in some battery cells within a battery module, there is a need to develop a structure that can suppress and delay heat propagation so as to prevent high-temperature gases or flames from being transferred to other battery cells within the battery module and causing thermal runaway.

[0008] Accordingly, the problem to be solved by the present invention is to provide a battery module that can effectively prevent or delay the propagation of thermal runaway between battery cells by blocking the path of high-temperature gas or flames toward adjacent battery cells.

[0009] Another problem to be solved by the present invention is to provide a battery pack and a vehicle including such 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, a battery module according to one embodiment of the present invention includes: a plurality of battery cells; a module case configured to accommodate the plurality of battery cells and having a first venting hole formed on one side thereof, the first venting hole configured to discharge venting gas generated from the battery cells to the outside; and a compression member configured to block fluid movement between at least two battery cells between the plurality of battery cells and one side of the module case.

[0012] The compression member may be configured to fill a space between the battery cell and the module case.

[0013] The above compression member may be configured in a sheet shape.

[0014] The above compression member may be configured to be in close contact with the upper portion of the battery cell.

[0015] The above compression member may be configured to be partially inserted into the first venting hole.

[0016] The above compression member may be formed with a second venting hole formed at a position corresponding to the first venting hole.

[0017] The above compression member may have a connecting portion configured to protrude outward from the outer surface of the second venting hole and be inserted into the first venting hole.

[0018] The device further includes a blocking member provided between the battery cells and configured to partition the plurality of battery cells, wherein the compression member can be configured such that an end of the blocking member is in contact with it.

[0019] The above compression member may be configured such that an end of the blocking member is inserted therein.

[0020] It may further include a cover member configured to cover one side of the module case from the outside.

[0021] The above cover member may have a notching portion provided at a position corresponding to the first venting hole.

[0022] In addition, the present invention provides a battery pack characterized by including a battery module according to the present invention.

[0023] And, the present invention provides an automobile characterized by including a battery pack according to the present invention.

[0024] According to one aspect of the present invention, movement of fluids such as flames, particles, and high-temperature gases between battery cells can be blocked by a compression member interposed in the empty space between the battery cells and the module case.

[0025] That is, according to the above aspect of the present invention, even if a thermal event occurs in some battery cells within a battery module, the transfer of gas or flames to other battery cells within the battery module and causing thermal runaway can be effectively prevented or delayed. This ensures the safety and reliability of the battery module.

[0026] In addition, according to another aspect of the present invention, high-temperature gases or flames generated in battery cells within a battery module can be smoothly discharged to the outside of the battery module, thereby preventing or delaying the propagation of thermal runaway due to an increase in internal pressure of the battery module.

[0027] Furthermore, according to another aspect of the present invention, since the compression member is configured to be coupled with the venting hole of the module case, the compression member can be prevented from being deformed or damaged even when thermal runaway occurs within the battery module. Accordingly, the structural stability of the battery module can be secured.

[0028] In addition, according to another aspect of the present invention, an event due to thermal runaway phenomenon, such as a fire or explosion, of a battery pack including a plurality of battery modules or a device equipped with the same can be prevented or delayed.

[0029] 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.

[0030] 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.

[0031] FIG. 1 is a perspective view of a battery module according to one embodiment of the present invention.

[0032] Figure 2 is an exploded perspective view of a battery module according to one embodiment of the present invention.

[0033] FIG. 3 is a perspective view of a battery cell included in a battery module according to one embodiment of the present invention.

[0034] Fig. 4 is a cross-sectional view of a battery module according to one embodiment of the present invention. For example, Fig. 4 may be a drawing illustrating cross-section I-I' of Fig. 1.

[0035] FIG. 5 is an enlarged view of part A of FIG. 4, and is a drawing for explaining the structure of a compression member included in a battery module according to one embodiment of the present invention.

[0036] FIG. 6 is a bottom perspective view of a compression member included in a battery module according to one embodiment of the present invention.

[0037] FIG. 7 is a top perspective view of a compression member included in a battery module according to one embodiment of the present invention.

[0038] Figure 8 is an enlarged perspective view of a battery module according to one embodiment of the present invention.

[0039] Fig. 9 is a cross-sectional view of a battery module according to one embodiment of the present invention. For example, Fig. 9 may be a drawing illustrating cross-section II-II' of Fig. 1.

[0040] FIG. 10 is a cross-sectional view showing a disassembled portion of a battery module according to one embodiment of the present invention.

[0041] FIG. 11 is a drawing for explaining a cover member included in a battery module according to another embodiment of the present invention.

[0042] FIG. 12 is a cross-sectional view of a battery module according to another embodiment of the present invention.

[0043] FIG. 13 is a drawing showing that a cover member is opened when a thermal event occurs in a battery module according to another embodiment of the present invention.

[0044] FIG. 14 is a schematic perspective view of a battery pack including a battery module according to one embodiment of the present invention.

[0045] FIG. 15 is a schematic perspective view of a vehicle including a battery pack according to one embodiment of the present invention.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] For example, in an embodiment of the present invention, the X-axis direction shown in the drawing may mean the left-right direction, the Y-axis direction may mean the front-back direction perpendicular to the X-axis direction on a horizontal plane (XY plane), that is, the length direction of the battery cell, and the Z-axis direction may mean the up-down direction (vertical direction) perpendicular to both the X-axis direction and the Y-axis direction, that is, the height direction of the battery cell.

[0051]

[0052] FIG. 1 is a perspective view of a battery module according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a battery module according to an embodiment of the present invention. Furthermore, FIG. 3 is a perspective view of a battery cell included in a battery module according to an embodiment of the present invention. Furthermore, FIG. 4 is a cross-sectional view of a battery module according to an embodiment of the present invention. For example, FIG. 4 may be a cross-sectional view taken along line I-I' of FIG. 1.

[0053] Referring to FIGS. 1 to 4, a battery module (10) according to one embodiment of the present invention may include a battery cell (100), a module case (200), and a compression member (300).

[0054] The above battery cell (100) may be provided in multiple units. The multiple battery cells (100) may be provided by being stacked in one direction. For example, as shown in FIG. 2, the multiple battery cells (100) may be stacked along the left-right direction (X-axis direction).

[0055] As illustrated in the embodiment of FIG. 3, the battery cell (100) may be a pouch-type secondary battery. The battery cell (100) may include an electrode assembly and a cell case (110) that accommodates the electrode assembly. The cell case (110) may include a receiving portion (111) configured to accommodate the electrode assembly, and a sealing portion (112) formed by heat-sealing a periphery of the receiving portion (111). The sealing portion (112) may be provided on three of the four sides of the battery cell (100).

[0056] Additionally, a plurality of battery cells (100) may each be provided with an electrode lead (120). The electrode lead (120) is connected to the electrode assembly and may be extended to the outside of the cell case (110) to function as an electrode terminal.

[0057] The electrode leads (120) may be provided as a pair, and the pair of electrode leads (120) may be extended from both ends of the battery cell (100), i.e., in the longitudinal direction (±Y direction). At this time, the pair of electrode leads (120) may be a positive lead and a negative lead. If necessary, the battery cell (100) may have a form in which the two electrode leads (120) are positioned only at one end in the Y-axis direction, for example, only at the end in the +Y-axis direction.

[0058] The battery cell (100) may be provided in an upright state with the surface that does not include the sealing portion (112) facing downward. 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 left-right direction (X-axis direction). At this time, each battery cell (100) may have the sealing portion (112) facing the front-back direction (Y-axis direction) and the upper direction (+Z-axis direction), and the storage portion (111) facing the left-right direction (X-axis direction).

[0059] At this time, referring to FIG. 3, the cell case (110) may be provided with a cell terrace (112a) on the side of the sealing portion (112) where the electrode lead (120) is provided. In addition, the cell case (110) may include a folding portion (112b) provided so as to be folded on one side of the sealing portion (112) where the electrode lead (120) does not protrude. That is, the cell case (110) may be provided with a folding portion (112b) on the side of the sealing portion (112) where the electrode lead (120) is not provided. This folding portion (112b) may be provided on the upper portion of the battery cell (100).

[0060] By arranging the battery cells (100) in this manner, it is easy to control the venting direction to one side, and cooling performance can be secured by performing edge cooling through the surface that does not include the sealing portion.

[0061] 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. In this embodiment, a pouch-type secondary battery with high energy density and easy stacking is used as the target, as shown in the drawing, but it is of course possible for a cylindrical or square secondary battery to be applied as the battery cell (100).

[0062] Additionally, the battery cell (100) of the present invention may mean one battery or a group of more batteries.

[0063] Meanwhile, referring to FIG. 2, the battery module (10) of the present invention may further include a busbar frame assembly (600). The busbar frame assembly (600) may be provided inside the module case (200) and configured to cover at least one side of the plurality of battery cells (100). In the present embodiment, as illustrated in FIG. 2, the busbar frame assembly (600) may be coupled to the front and rear of the plurality of battery cells (100).

[0064] The busbar frame assembly (600) may include a busbar frame (610) and a plurality of busbars (620). The busbar frame (610) may be arranged to be connected to the front and rear of a plurality of battery cells (100). The busbar frame (610) may have slits through which electrode leads (120) of the battery cells (100) may be drawn out in the +Y-axis or -Y-axis direction. In addition, the busbar frame (610) may be formed of a material having electrical insulation, such as a plastic material, and may be configured to allow a busbar (620) to be attached to an outer surface thereof.

[0065] A plurality of bus bars (620) are provided in the form of bars and are made of a metal material such as copper, aluminum, nickel, etc. as a means for connecting battery cells (100) in series and / or in parallel. The electrode leads (120) of the battery cells (100) pass through slits in the bus bar frame (610) and are drawn outward from the bus bar frame (610), and the portion drawn out in this manner can be attached to the surface of the bus bar (620) by welding or the like.

[0066] The above module case (200) may be configured to accommodate a plurality of battery cells (100). Specifically, the module case (200) may be configured to have an internal space formed therein, and to accommodate a plurality of battery cells (100) in the internal space.

[0067] A first venting hole (H1) may be formed in the module case (200). The first venting hole (H1) may be provided to discharge venting gas generated in the battery cell (100) to the outside of the module case (200).

[0068] For example, as illustrated in FIG. 1, a first venting hole (H1) may be formed on the upper surface of the module case (200). As a result, directional venting of the battery module (10) toward the top may be possible through the first venting hole (H1).

[0069] Specifically, a plurality of first venting holes (H1) may be provided, and may be provided at regular intervals between each other in the horizontal direction (X-axis, Y-axis direction).

[0070] Meanwhile, considering the convenience of assembly, assembly tolerance, etc., one side of the module case (200) and the battery cell (100) may be provided to be spaced apart by a predetermined distance. In such a case, if a thermal event occurs in one of the battery cells (100), there is a risk that venting gas or flames may be transferred to another adjacent battery cell (100) through the predetermined distance formed between the battery cell (100) and the module case (200).

[0071] Accordingly, the battery module (10) according to one embodiment of the present invention may include a compression member (300). The compression member (300) may be provided on the inside of the module case (200). More specifically, referring to FIG. 4, the compression member (300) may be provided between a plurality of battery cells (100) and one side of the module case (200). The one side of the module case (200) may refer to a side where the first venting hole (H1) is formed.

[0072] As described above, the battery cells (100) are stacked along the horizontal direction while being erected vertically, and the compression member (300) may be configured to extend along the horizontal direction (the stacking direction of the battery cells (100)) on one side of the battery cells (100). Accordingly, the compression member (300) may be configured to block the movement of fluid between at least two battery cells (100) in the space between the plurality of battery cells (100) and one side of the module case (200). The fluid may refer to venting gas, flame, and / or particles, etc.

[0073] Additionally, at least two battery cells (100) may be separated from each other by a compression member (300). That is, the compression member (300) may be configured to separate the space between at least two battery cells (100). In this case, as in the embodiment illustrated in FIG. 3, the compression member (300) may be configured to separate the space between all battery cells (100).

[0074] When a thermal event occurs in one battery cell (100), venting gas or flames, etc. may move toward the space between the plurality of battery cells (100) and the module case (200), and there is a concern that such venting gas or flames, etc. may move along the stacking direction of the battery cells (100) in the space between the plurality of battery cells (100) and the module case (200) and be transferred to other adjacent battery cells (100). However, according to the above-described embodiment of the present invention, even if a thermal event occurs in any of the battery cells (100) of the battery module (10), the movement of the venting gas, flames, and / or particles, etc., toward other battery cells (100) can be suppressed by the compression member (300).

[0075] Accordingly, when a thermal event occurs in a battery cell (100), venting gas or flames are prevented from being transferred to adjacent battery cells (100), so that thermal runaway propagation between battery cells (100) can be effectively prevented or delayed. Accordingly, the safety and reliability of the battery module (10) can be guaranteed.

[0076] Meanwhile, the compression member (300) may be formed of a compressible material. For example, the compression member (300) may be formed of any one of silicone, aerogel, polyurethane, and the like. Accordingly, the compression member (300) may be configured to be in complete contact between the module case (200) and the battery cell (100). Accordingly, the movement of fluid toward the other battery cell (100) may be further prevented.

[0077] In addition, the compression member (300) may be formed of a material having electrical insulation properties. This ensures electrical insulation between the battery cell (100) and the module case (200). In addition, the compression member (300) may be formed of a material having excellent heat resistance and / or fire resistance. As an example, the compression member (300) may be formed of a mica material. This allows the compression member (300) to be configured to maintain a sealed structure without deformation even under high temperatures and high pressures.

[0078] Meanwhile, the compression member (300) may include multiple materials rather than a single material. For example, the portion that comes into contact with the battery cell (100) or module case (200) may be made of a material having compressibility, and the inner portion thereof may be made of a material having excellent heat resistance and / or fire resistance.

[0079] According to the above-described embodiment of the present invention, the gap between the compression member (300) and the battery cell (100) or module case (200) can be minimized, while preventing deformation or damage caused by high-temperature or high-pressure fluid.

[0080]

[0081] Meanwhile, referring to FIG. 2, the module case (200) may include a case body (210) and a top plate (220). The case body (210) may be configured such that at least the upper surface is open. For example, the case body (210) may be configured such that the upper surface, front surface, and rear surface are open. That is, the case body (210) may be provided as a U-frame.

[0082] The case body (210) may be made of a metal material having rigidity and heat resistance to physically or chemically protect the received battery cell (100).

[0083] The above top plate (220) may be provided to form the upper surface of the module case (200). The top plate (220) may be coupled to the open upper surface of the case body (210). The top plate (220) may be welded to the case body (210) to be coupled to each other. At this time, the shape in which the top plate (220) and the case body (210) are coupled may be a square tubular shape with the front and back sides open.

[0084] Meanwhile, the module case (200) may include an end plate (230) provided on the open front and rear sides of the case body (210). The end plate (230) may be welded and joined to the case body (210). Meanwhile, although not shown for convenience, the end plate (230) 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 (230) 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 (200) may be formed in various other shapes. For example, the module case (200) may have a box-shaped lower case having an upper open end and an upper cover that closes the upper open end of the lower case.

[0086] At this time, as in the embodiment illustrated in FIG. 4, the first venting hole (H1) may be formed in the top plate (220). In addition, the compression member (300) may be interposed between the battery cell (100) and the top plate (220). That is, the compression member (300) may be configured to fill the space between the upper surface of the battery cell (100) stack and the top plate (220).

[0087] High-temperature gases such as venting gas or flames generated from the battery cells (100) have a strong tendency to rise and may head toward the empty space provided at the top of the battery cells (100). At this time, according to the above-described embodiment of the present invention, since the protrusion (P) is provided at the top of the battery cells (100), it is possible to minimize the heat such as venting gas or flames from heading toward other battery cells (100).

[0088] In addition, since this compression member (300) is located inside the battery module (10), it does not increase the height of the battery module (10) and does not cause changes in the appearance of the battery module (10). Accordingly, according to the above-described embodiment of the present invention, the energy density of the battery module (10) can be prevented from being affected.

[0089]

[0090] FIG. 5 is an enlarged view of portion A of FIG. 4, and is a drawing for explaining the structure of a compression member included in a battery module according to one embodiment of the present invention. In addition, FIG. 6 is a bottom perspective view of a compression member included in a battery module according to one embodiment of the present invention.

[0091] The compression member (300) may be configured to fill the space between the battery cell (100) and the module case (200). The compression member (300) may be configured to extend not only in the stacking direction of the battery cell (100) but also in the longitudinal direction. That is, the compression member (300) may be configured to cover one side of the battery cell (100) along the horizontal direction. Accordingly, the compression member (300) may be configured to separate the space between two battery cells (100) among the entire battery cells (100).

[0092] In particular, as in the embodiment illustrated in FIG. 6, the compression member (300) may be configured in a sheet shape. Accordingly, the compression member (300) may be configured to face the battery cell (100) and the module case (200) in parallel. In addition, all surfaces of the compression member (300) may be configured to be in close contact with the module case (200) and the battery cell (100).

[0093] According to the above-described embodiment of the present invention, the horizontal movement of fluids such as flames, particles, and high-temperature gases between the battery cells (100) can be more reliably blocked by the sheet-shaped compression member (300) interposed in the empty space between the battery cells (100) and the module case (200).

[0094] In addition, according to the above-described embodiment of the present invention, the sheet-shaped compression member (300) can be applied to the entire space between the battery cell (100) and the module case (200) rather than locally dividing the space. Accordingly, even if a high-temperature or high-pressure fluid is generated due to thermal runaway of the battery cell (100), the lifting of the compression member (300) can be minimized, thereby suppressing the creation of an empty space at the upper end of the battery cell (100).

[0095] In addition, referring to FIG. 5, the compression member (300) may be made of a material having compressibility and configured to be compressed in the vertical direction by one side of the module case (200) and a plurality of battery cells (100). Accordingly, the compression member (300) may be configured to be in close contact with the upper portion of the battery cell (100).

[0096] More specifically, the compression member (300) may be configured to contact the sealing member (112) located at the upper portion of the battery cell (100). In other words, the compression member (300) may be configured to contact the folding member (112b). The compression member (300) may be configured to press the folding member (112b) inward. As a result, the compression member (300) may fix the folding member (112b).

[0097] According to the above-described embodiment of the present invention, as the compression member (300) is compressed and interposed in the vertical direction, the compression member (300) can be more closely attached to the upper surface of the battery cell (100). Accordingly, the empty space between the battery cell (100) and the module case (200) is further sealed, so that the movement of a fluid such as a venting gas or flame beyond the compression member (300) toward another battery cell (100) can be further prevented.

[0098] Meanwhile, the compression member (300) may be provided in a protruding shape along the shape of the upper side of the battery cell (100). As a more specific example, the compression member (300) may be provided with a protrusion (P) configured such that at least a portion thereof protrudes toward the battery cell (100). The protrusion (P) may be provided on the lower surface of the compression member (300). The protrusion (P) may be configured such that at least a portion thereof protrudes downward from the lower outer surface of the compression member (300).

[0099] Referring to FIG. 5, a protrusion (P) may be interposed in a space between at least two battery cells (100). The protrusion (P) may be configured to block fluid movement between at least two battery cells (100). As in the embodiment illustrated in FIG. 5, the protrusion (P) may be provided between every two battery cells (100).

[0100] The protrusion (P) may be provided in a shape corresponding to the space between the battery cells (100). The protrusion (P) may be configured to contact the battery cell (100). In particular, the protrusion (P) may be configured to be in close contact with the folding portion (112b) of the battery cell (100).

[0101] Referring to Fig. 6, a plurality of such protrusions (P) may be provided along one direction. The one direction may be defined as the direction in which the battery cells (100) are stacked, i.e., the left-right direction (the direction parallel to the X-axis). In addition, the protrusions (P) may be configured to extend along the longitudinal direction (front-back direction) of the battery cells (100). The protrusions (P) may be provided to correspond to the front-back length of the battery cells (100).

[0102] According to the above-described embodiment of the present invention, since both sides of each battery cell (100) are blocked by the protrusions (P), the movement of a fluid such as a venting gas toward another battery cell (100) can be prevented. In addition, according to the above-described embodiment of the present invention, even if a high temperature or high pressure fluid is generated due to thermal runaway of the battery cell (100), the lifting of the compression member (300) from the battery cell (100) can be minimized, thereby suppressing the formation of an empty space at the upper end of the battery cell (100).

[0103]

[0104] Fig. 7 is a top perspective view of a compression member included in a battery module according to one embodiment of the present invention, and Fig. 8 is an enlarged perspective view of a battery module according to one embodiment of the present invention. In addition, Fig. 9 is a cross-sectional view of a battery module according to one embodiment of the present invention. For example, Fig. 9 may be a drawing showing a cross-section taken along line II-II' of Fig. 1. In addition, Fig. 10 is a cross-sectional view showing a partial exploded configuration of a battery module according to one embodiment of the present invention.

[0105] Meanwhile, referring to FIG. 7, a second venting hole (H2) may be formed in the compression member (300). The second venting hole (H2) may be formed by penetrating at least a portion of the compression member (300). The second venting hole (H2) may be configured to allow venting gas, etc. generated in the battery cell (100) to be discharged to the outside.

[0106] A plurality of second venting holes (H2) may be provided, and may be provided at regular intervals in the horizontal direction (X-axis, Y-axis direction). In particular, the second venting holes (H2) may be formed at a position corresponding to the first venting hole (H1). In addition, the second venting hole (H2) may be configured in a shape corresponding to the first venting hole (H1).

[0107] According to the above-described embodiment of the present invention, when a thermal event occurs in a specific battery cell (100), venting gas or the like can be discharged to the outside of the module case (200) through the second venting hole (H2) and the first venting hole (H1) provided on one side of the specific battery cell (100).

[0108] Meanwhile, referring to FIGS. 8 and 9, the compression member (300) may be configured to be coupled to one side of the module case (200), for example, the top plate (220). Specifically, when manufacturing the battery module (10), the compression member (300) may be coupled to the top plate (220), and then the top plate (220) may be coupled to the case body (210). At this time, the compression member (300) may be configured to be partially inserted into the first venting hole (H1).

[0109] According to the above-described embodiment of the present invention, since the assembly position of the compression member (300) can be guided during the process of combining the compression member (300) with the top plate (220), the assembling performance can be improved. In addition, according to the above-described embodiment of the present invention, since the compression member (300) is combined with the first venting hole (H1) of the top plate (220), the fixing force therebetween can be improved. Accordingly, even when thermal runaway occurs within the battery module (10), the compression member (300) can be prevented from being deformed or damaged, thereby ensuring the structural stability of the battery module (10).

[0110] As a more specific example, referring to FIGS. 8 and 9, the compression member (300) may include a connecting portion (310). The connecting portion (310) may be configured to protrude outward from the outer surface of the second venting hole (H2). In other words, the second venting hole (H2) may be provided between the connecting portions (310). This connecting portion (310) may be configured to be inserted into the first venting hole (H1).

[0111] The connecting portion (310) may be formed along the inner circumference of the first venting hole (H1). The connecting portion (310) may be configured to be supported on the inner surface of the first venting hole (H1). That is, the connecting portion (310) may be configured to protrude vertically (upward) from the main body of the compression member (300) and be arranged horizontally with the first venting hole (H1) of the top plate (220).

[0112] According to the above-described embodiment of the present invention, since the surrounding area is all blocked based on the joint (310), the venting gas generated in the battery cell (100) may be guided and discharged only toward the first venting hole (H1) and the second venting hole (H2) without moving toward other battery cells (100) (see the bold arrows in Fig. 9). In other words, directional venting of gas in the upward direction can be more effectively guided by the joint (310).

[0113] Accordingly, according to the above-described embodiment of the present invention, the time during which high-temperature venting gas or flames remain inside the battery module (10) in the battery cell (100) region where a thermal event occurs can be shortened. Accordingly, the internal pressure of the battery module (10) can be increased, thereby preventing or delaying the propagation of thermal runaway.

[0114] In addition, according to the above-described embodiment of the present invention, since the coupling portion (310) is inserted and fixed into the first venting hole (H1), the mutual fixing force between the top plate (220) and the compression member (300) can be improved. Accordingly, even when thermal runaway occurs within the battery module (10), the compression member (300) can be prevented from being deformed or damaged, thereby ensuring the structural stability of the battery module (10).

[0115] Moreover, the module case (200) (particularly, the top plate (220)) is made of a metal material with high thermal conductivity, such as aluminum, so that heat can be transferred from the module case (200) itself when a thermal event occurs. However, according to the above-described embodiment of the present invention, the coupling portion (310) of the compression member (300) covers the inner surface of the first venting hole (H1), i.e., the top plate (220), so that the insulation performance of the module case (200) can be improved. As a result, heat transmission through the module case (200) can be suppressed.

[0116]

[0117] Meanwhile, referring to FIG. 10, the battery module (10) according to one embodiment of the present invention may further include a blocking member (400). The blocking member (400) may be accommodated in the internal space of the module case (200). The blocking member (400) may be provided between the battery cells (100). At least one blocking member (400) may be included in one battery module (10). A plurality of blocking members (400) may be provided along one direction in which the battery cells (100) are arranged. The blocking member (400) may be provided in a form in which it is arranged for at least one battery cell (100).

[0118] In particular, the blocking member (400) may be configured to partition between a plurality of battery cells (100). The blocking member (400) may be configured to group a plurality of battery cells (100). For example, as illustrated in FIG. 10, a blocking member (400) may be arranged for each of four battery cells (100), thereby grouping the battery cells (100) in groups of four.

[0119] The blocking member (400) may be provided as an insulating pad thinner than the battery cell (100). The blocking member (400) may be provided with a material having excellent heat resistance and / or fire resistance. Alternatively, the blocking member (400) may be provided in the form of a compressible pad, for example, with a material such as silicone or aerogel.

[0120] According to the above-described embodiment of the present invention, the battery cells (100) can be partitioned or separated to prevent gas or flames from being transferred to another blocking member (400) adjacent to the blocking member (400). In addition, according to the above-described embodiment of the present invention, the blocking member (400) can contribute to the structural rigidity of the battery cells (100) by compressing the battery cells (100) when the battery cells (100) are swollen.

[0121] Meanwhile, one side of the module case (200), i.e., the top plate (220) and the blocking member (400), may be provided to be spaced apart by a predetermined distance. Specifically, the blocking member (400) may be provided to extend outward, for example, upward, more than the battery cell (100). The blocking member (400) may be provided to extend upward more than the storage portion of the battery cell (100). That is, the vertical height of the blocking member (400) may be provided to be longer than the vertical height of the battery cell (100).

[0122] According to the above-described embodiment of the present invention, the blocking member (400) can more reliably separate the battery cells (100) and reliably block the movement of venting gas or flames.

[0123] The blocking member (400) may be configured to face the protrusion (P) of the compression member (300). Meanwhile, the compression member (300) may be configured such that an end of the blocking member (400) is in contact with it. The compression member (300) may at least partially contact the upper surface of the blocking member (400). The blocking member (400) may be configured to be in contact with the protrusion (P).

[0124] The compression member (300) can be in surface contact with the blocking member (400). The compression member (300) and the blocking member (400) can be configured to be in surface contact along the longitudinal direction of the blocking member (400).

[0125] According to the above-described embodiment of the present invention, the gap between the compression member (300) and the blocking member (400) is minimized, so the space in which the venting gas can flow is reduced, and thus the propagation of thermal runaway to other adjacent battery cells (100) can be more reliably prevented.

[0126] In addition, according to the above-described embodiment of the present invention, when the top plate (220) is coupled to the case body (210), the lower surface of the compression member (300) and the upper surface of the blocking member (400) can naturally come into close contact with each other. Moreover, since the blocking member (400) has compressibility, it can come into closer contact with the compression member (300). Accordingly, the space between the blocking member (400) and the compression member (300) can be further sealed, so that venting gas or flames, etc., can be further suppressed from moving beyond the blocking member (400).

[0127] Furthermore, as in the embodiments illustrated in FIGS. 9 and 10, the compression member (300) may be configured such that an end of the blocking member (400) is inserted therein. More specifically, referring to FIG. 10, the compression member (300) may have a fixing groove (G) formed by at least a portion being recessed inward. The blocking member (400) may be inserted into and provided in this fixing groove (G). The fixing groove (G) may be provided in a protrusion (P) of the compression member (300).

[0128] According to the above-described embodiment of the present invention, the upper end of the blocking member (400) can be provided in close contact with the fixing groove (G) without a gap. Accordingly, the blocking member (400) can be inserted into the compression member (300) and supported from both sides, so that the fixing force between the blocking member (400) and the compression member (300) can be improved. As a result, the arrangement of the battery cell (100) and the blocking member (400) can be stably maintained.

[0129] In addition, the sealing force between the end portion of the blocking member (400) and the compression member (300) can be stably secured. Therefore, according to the above-described implementation configuration, the plurality of battery cells (100) can be more reliably separated from each other, so that thermal runaway propagation between the battery cells (100) can be effectively prevented or delayed.

[0130] Moreover, according to the above-described embodiment of the present invention, it is possible to reduce the possibility that high-temperature, high-pressure venting gas or flame pushes out the blocking member (400) or that the blocking member (400) is bent and deformed by the internal pressure of the venting gas, thereby causing heat to be transferred to another battery cell (100).

[0131] In addition, according to the above-described embodiment of the present invention, when the top plate (220) is coupled to the case body (310), the blocking member (400) can be naturally inserted into the fixing groove (G) of the compression member (300). As a result, the assembly efficiency can be improved when assembling the battery module (10).

[0132]

[0133] FIG. 11 is a drawing for explaining a cover member included in a battery module according to another embodiment of the present invention, and FIG. 12 is a cross-sectional view of a battery module according to another embodiment of the present invention. In addition, FIG. 13 is a drawing showing that a cover member is opened when a thermal event occurs in a battery module according to another embodiment of the present invention.

[0134] Referring to FIGS. 11 to 13, a battery module (10) according to one embodiment of the present invention may further include a cover member (500).

[0135] Referring to FIGS. 11 and 12, the cover member (500) may be configured to at least partially cover the module case (200). For example, it may be configured to cover the top plate (220). The cover member (500) may be provided on the outside and / or inside of the module case (200).

[0136] In particular, the cover member (500) may be configured to cover the first venting hole (H1) and the second venting hole (H2). In this case, the cover member (500) may be configured in a sheet shape and may be mounted on the module case (200). The cover member (500) may be configured to cover a plurality of first venting holes (H1) and second venting holes (H2) at once.

[0137] The cover member (500) 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 modules (10). To this end, the cover member (500) may be made of a material having excellent heat- and / or fire-resistant properties, such as a mica sheet or a silicone composite material.

[0138] Accordingly, the cover member (500) 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).

[0139] According to the above-described embodiment of the present invention, since the cover member (500) is made of a hard and heat-resistant material, deformation due to high-temperature gas or flames can be minimized.

[0140] Such a cover member (500) may be configured to be at least partially openable and closable by venting gas or flame, as in the embodiment illustrated in FIG. 13. Specifically, at least a portion of the cover member (500) may be configured to be ruptured by the pressure or heat of the venting gas directed toward the first venting hole (H1) and the second venting hole (H2). Alternatively, at least a portion of the cover member (500) may be configured to be completely separated.

[0141] For this purpose, the cover member (500) 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).

[0142] 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 positions corresponding to the first venting hole (H1) and / or the second venting hole (H2). In addition, the notching portions (N) may be configured in a shape corresponding to the first venting hole (H1) and / or the second venting hole (H2).

[0143] 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 be ruptured, thereby opening at least one of a plurality of first venting holes (H1) and second venting holes (H2). Accordingly, venting gas and the like may be discharged to the outside of the module case (200) through the opened first venting holes (H1) and second venting holes (H2) (see bold arrows in FIG. 13).

[0144] In addition, the cover member (500) can prevent gas or flame discharged to the outside of the module case (200) from flowing back into the inside of the battery module (10). That is, the first venting hole (H1) and the second venting hole (H2) 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 opened first venting hole (H1) and second venting hole (H2) can be fundamentally blocked from flowing back into the inside of the battery module (10). In addition, the cover member (500) that remains unruptured can block not only heat but also high-temperature gas, flame, discharged matter, etc. generated from the battery cell (100).

[0145] 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).

[0146]

[0147] FIG. 14 is a schematic perspective view of a battery pack including a battery module according to one embodiment of the present invention.

[0148] Referring to FIG. 14, a battery pack (1) according to one embodiment of the present invention may include one or more battery modules (10) according to one embodiment of the present invention as described above. The battery pack (1) according to the present invention may further include a pack case (2) for accommodating a BMS (Battery Management System), a current sensor, a fuse, and the like for integrated control of charging and discharging of one or more battery modules, and the above-described components.

[0149]

[0150] FIG. 15 is a schematic perspective view of a vehicle including a battery pack according to one embodiment of the present invention.

[0151] Referring to FIG. 15, a vehicle (3) according to an embodiment of the present invention may include one or more battery packs (1) according to an embodiment of the present invention or battery modules (10) according to an embodiment of the present invention. The vehicle (3) according to the present invention may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The vehicle (3) includes a four-wheel vehicle and a two-wheel vehicle. The vehicle (3) operates by receiving power from a battery pack (1) or a battery module (10) according to an embodiment of the present invention.

[0152]

[0153] 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 module case configured to accommodate the plurality of battery cells and having a first venting hole formed on one side thereof to discharge venting gas generated from the battery cells to the outside; and A battery module characterized by comprising a compression member configured to block fluid movement between at least two battery cells between the plurality of battery cells and one side of the module case.

2. In paragraph 1, A battery module characterized in that the compression member is configured to fill a space between the battery cell and the module case.

3. In paragraph 1, A battery module characterized in that the above compression member is configured in a sheet shape.

4. In paragraph 1, A battery module characterized in that the compression member is configured to be in close contact with the upper portion of the battery cell.

5. In paragraph 1, A battery module characterized in that the compression member is configured to be partially inserted into the first venting hole.

6. In paragraph 1, A battery module characterized in that the compression member has a second venting hole formed at a position corresponding to the first venting hole.

7. In paragraph 6, The above compression member A battery module characterized by having a connecting portion configured to protrude outward from the outer surface of the second venting hole and be inserted into the first venting hole.

8. In paragraph 1, Further comprising a blocking member provided between the battery cells and configured to partition the plurality of battery cells, A battery module characterized in that the compression member is configured such that an end of the blocking member is in contact with it.

9. In paragraph 8, A battery module characterized in that the compression member is configured such that an end of the blocking member is inserted therein.

10. In paragraph 1, A battery module characterized in that it further includes a cover member configured to cover one side of the module case from the outside.

11. In paragraph 10, A battery module characterized in that the cover member has a notching portion provided at a position corresponding to the first venting hole.

12. A battery pack comprising a battery module according to any one of claims 1 to 11.

13. A vehicle characterized by including a battery module according to any one of claims 1 to 11.

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