Safety-enhanced battery module

Abstract

The present invention discloses a battery module having an improved structure to ensure safety. A battery module according to one aspect of the present invention includes a cell assembly having one or more battery cells, a module case that houses the cell assembly in an internal space and has a vent hole formed therein so that gas in the internal space can be discharged to the outside, a filtering member that is provided in the vent hole of the module case and configured to filter foreign matter from flowing into the internal space from the external space through the vent hole, and a number of mesh members each configured in a mesh shape and provided on both sides of the filtering member.

Description

[Technical Field]

[0001] This application claims priority based on Korean Patent Application No. 10-2022-0026811, filed on March 2, 2022, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings thereof.

[0002] The present invention relates to a battery, and more particularly to a battery module with enhanced safety, a battery pack including the same, and a vehicle. [Background technology]

[0003] In recent years, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has grown rapidly and the commercialization of robots, electric vehicles, and the like has progressed in earnest, active research has been conducted into high-performance secondary batteries that can be repeatedly charged and discharged.

[0004] Currently, commercially available secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are attracting attention due to their advantages of being able to be freely charged and discharged since they have almost no memory effect compared to nickel-based secondary batteries, as well as their extremely low self-discharge rate and high energy density.

[0005] This type of lithium secondary battery mainly uses a lithium-based oxide and a carbon material as the positive and negative electrode active materials, respectively, and includes an electrode assembly in which a positive electrode plate and a negative electrode plate coated with the positive and negative electrode active materials are arranged with a separator sandwiched between them, and an exterior material, such as a battery case, that encloses the electrode assembly together with an electrolyte.

[0006] Generally, lithium secondary batteries can be broadly classified into can-type secondary batteries, in which the electrode assembly is housed in a metal can, and pouch-type secondary batteries, in which the electrode assembly is housed in a pouch made of an aluminum laminate sheet, depending on the shape of the exterior material.

[0007] Recently, secondary batteries have been widely used for driving and storing energy not only in small devices such as portable electronic devices but also in medium- to large-sized devices such as electric vehicles and energy storage systems (ESS). A battery module can be formed by electrically connecting a plurality of such secondary batteries and housing them together inside a module case. A battery pack can be formed by connecting a plurality of such battery modules.

[0008] Because a battery module contains multiple battery cells, if a thermal runaway occurs in one of the battery cells, the thermal runaway can easily propagate to other battery cells. Furthermore, if a thermal runaway occurs in one of the battery cells, vent gas may be generated. This vent gas must be quickly vented from the inside of the battery module to the outside. If the vent gas is not vented quickly, the pressure of the vent gas could distort the battery module's structure, such as the module case, potentially damaging, destroying, or exploding the battery module. Furthermore, oxygen may flow in through the distorted portion of the module case, potentially causing a fire or spreading of the combustion inside the battery module.

[0009] In addition, if an event such as thermal runaway occurs in one battery module, there is a concern that flames or the like may be discharged to the outside. If the discharge of flames or the like is not properly controlled, the flames or the like may be discharged toward other battery modules, causing a thermal chain reaction in the other battery modules. Furthermore, when a thermal event occurs inside a battery module, factors that can cause ignition, such as sparks, electrode ejection material, and charcoal, may be generated along with a large amount of flammable gas. Furthermore, if these ignition-inducing factors are discharged to the outside during gas discharge, they may encounter oxygen, resulting in a high risk of fire.

[0010] In addition, battery modules are required to have various other safety features such as waterproofness and dustproofness, etc. In particular, while the battery module has a structure for discharging gas to the outside, it is necessary to prevent moisture, dust, etc. from flowing in through the discharge structure. Summary of the Invention [Problem to be solved by the invention]

[0011] Therefore, the present invention has been devised to solve the above problems, and an object of the present invention is to provide a battery module having an improved structure to ensure safety in various aspects, and a battery pack and a vehicle including the same.

[0012] However, the technical problems that the present invention aims to solve are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention given below. [Means for solving the problem]

[0013] To achieve the above-mentioned object, according to one aspect of the present invention, a battery module includes: a cell assembly having one or more battery cells; a module case that houses the cell assembly in an interior space and has a vent hole formed therein so that gas in the interior space can be discharged to the outside; a filtering member that is provided in the vent hole of the module case and configured to filter foreign matter from flowing from the exterior space into the interior space through the vent hole; and a plurality of mesh members that are each configured in a mesh shape and are provided on both sides of the filtering member.

[0014] Here, the cell assembly may be formed by stacking a plurality of pouch-type secondary batteries in a left-right direction in an upright state, and the vent hole may be formed on at least one of the front and rear sides of the module case.

[0015] The module case may have a recessed mounting groove formed around the vent hole so that the mesh member can be fitted therein.

[0016] Furthermore, a plurality of the vent holes may be formed.

[0017] Furthermore, the mounting groove may be formed in a horizontally elongated shape.

[0018] Furthermore, the filtering element may be at least partially fitted into the vent hole.

[0019] Furthermore, the module case may include a blocking portion configured to block at least a portion of a mesh member provided on the outside of the filtering member from moving outward.

[0020] Furthermore, at least two of the multiple mesh members may have mesh holes with different hole diameters.

[0021] Furthermore, at least some of the multiple mesh members may have needle-like members formed to protrude inward or outward.

[0022] Furthermore, the module case may include a lower frame having an open upper end and an upper cover coupled to the open portion of the upper end of the lower frame, and the upper cover may be welded to at least a portion of the lower frame.

[0023] Furthermore, the upper cover may have a blocking protrusion protruding downward at a portion where the upper cover is joined to the lower frame.

[0024] Furthermore, the upper cover may include a sealing material configured to enclose the blocking protrusion.

[0025] In order to achieve the above object, a battery pack according to another aspect of the present invention includes a battery module according to the present invention.

[0026] Furthermore, in order to achieve the above object, according to yet another aspect of the present invention, a vehicle includes a battery module according to the present invention. [Effects of the Invention]

[0027] According to one aspect of the present invention, when vent gas is generated inside a battery module due to a thermal event or the like, the vent gas can be quickly discharged to the outside of the module.

[0028] Therefore, according to this aspect of the present invention, damage or explosion of the battery module caused by vent gas can be prevented.

[0029] In addition, according to one aspect of the present invention, if a spark or other flame occurs inside the module, the flame or other flame can be prevented from escaping to the outside, thereby preventing a fire from breaking out outside the battery module.

[0030] In particular, according to the above embodiment, the propagation of thermal runaway between battery modules is suppressed.

[0031] Furthermore, according to one aspect of the present invention, waterproof and dustproof performance can be stably ensured.

[0032] In particular, in the above-described embodiment of the present invention, under normal conditions, it is possible to stably and effectively prevent external foreign matter such as moisture and dust from flowing into the interior through the gas exhaust structure.

[0033] Furthermore, according to one aspect of the present invention, it is possible to effectively prevent oxygen from flowing in from the outside.

[0034] Therefore, according to this aspect of the present invention, it is possible to prevent a fire from breaking out, spreading, catching fire, or expanding inside the battery module.

[0035] In addition to these, the present invention can have various other additional effects, which will be explained in the respective embodiments, and explanations of effects that can be easily understood by those skilled in the art will be omitted.

[0036] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further understand the technical concepts of the present invention as well as the content of the invention, and therefore the present invention should not be interpreted as being limited to only the matters described in the drawings. [Brief explanation of the drawings]

[0037] [Figure 1] 1 is a perspective view schematically illustrating a configuration of a battery module according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded perspective view of the battery module of FIG. 1 with some components removed. [Figure 3]1 is a diagram schematically illustrating a cross-sectional configuration of a portion of a battery module according to an embodiment of the present invention. [Figure 4] 1 is an exploded perspective view schematically illustrating a partial configuration of a battery module according to an embodiment of the present invention. [Figure 5] 3 is an enlarged schematic view illustrating a cross-sectional configuration of a portion where a vent hole is formed in a battery module according to an embodiment of the present invention; FIG. [Figure 6] 3A and 3B are cross-sectional views schematically illustrating cross-sectional configurations of parts of battery modules according to different embodiments of the present invention; [Figure 7] 3A and 3B are cross-sectional views schematically illustrating cross-sectional configurations of parts of battery modules according to different embodiments of the present invention; [Figure 8] FIG. 10 is a perspective view schematically illustrating a partial configuration of a battery module according to yet another embodiment of the present invention. [Figure 9] 10 is a cross-sectional view showing a partial cross-sectional configuration of a battery module according to yet another embodiment of the present invention. [Figure 10] 10 is a cross-sectional view of a portion of a battery module according to yet another embodiment of the present invention, viewed from above. [Figure 11] 10 is a cross-sectional view schematically illustrating a cross-sectional configuration of a portion of a battery module according to yet another embodiment of the present invention. [Figure 12] 10 is a cross-sectional view schematically illustrating a cross-sectional configuration of a portion of a battery module according to yet another embodiment of the present invention. [Figure 13] 1 is a diagram schematically illustrating a cross-sectional configuration of a portion of a battery module according to an embodiment of the present invention. [Figure 14] FIG. 14 is an enlarged view of a portion A5 in FIG. 13. [Figure 15] 10 is a diagram schematically illustrating a cross-sectional configuration of a portion of a battery module according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0038] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in the specification and claims should not be construed as being limited to their ordinary or dictionary meanings, but should be construed as having meanings and concepts corresponding to the technical ideas of the present invention, in accordance with the principle that the inventors themselves can appropriately define the concepts of terms in order to best explain the invention.

[0039] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of the present invention, and that there may be various equivalents and modifications that can be substituted therefor at the time of this application.

[0040] FIG. 1 is a perspective view schematically illustrating the configuration of a battery module according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view illustrating the battery module of FIG. 1 with some components removed.

[0041] 1 and 2, a battery module according to the present invention includes a cell assembly 100, a module case 200, a filtering member 300, and a mesh member 400.

[0042] The cell assembly 100 may include one or more battery cells. Here, the term "battery cell" may refer to a secondary battery. A secondary battery may include an electrode assembly, an electrolyte, and a battery case. In particular, the battery cell provided in the cell assembly 100 may be a pouch-type secondary battery. However, other types of secondary batteries, such as cylindrical batteries and prismatic batteries, may also be employed in the cell assembly 100 of the present invention.

[0043] The module case 200 may be configured to have an empty space formed therein and to accommodate the cell assembly 100 therein. For example, the module case 200 may be configured in the shape of a rectangular parallelepiped including six plates. The cell assembly 100 may be accommodated in the internal space of the rectangular parallelepiped. In this case, at least some of the plates constituting the module case 200 may be configured to be integral with each other. Alternatively, the six plates may be manufactured separately and then joined together by welding, bolting, or the like. The module case 200 may be made of a metal material such as aluminum. However, the present invention is not limited to such a specific material for the module case 200.

[0044] In addition, the module case 200 may be formed with a vent hole, as indicated by H1 in FIG. 2 . The vent hole H1 may be configured to allow gas in the interior space of the module case 200 to be discharged to the outside. That is, the vent hole H1 may be configured to penetrate the module case 200 in an inward-outward direction. In particular, if a thermal runaway phenomenon occurs in some battery cells of the cell assemblies 100 housed in the interior space of the module case 200, vent gas may be discharged into the interior space of the module case 200. In this case, the vent hole H1 may be configured to allow the vent gas trapped in the interior space of the module case 200 to be discharged to the outside of the module case 200.

[0045] The vent hole H1 may be formed in a circular shape, but the present invention is not necessarily limited to such a shape of the vent hole H1.

[0046] Meanwhile, in this specification, unless otherwise specified or explained, the inward direction may mean the direction toward the center of the battery pack, and the outward direction may mean the opposite direction.

[0047] The filtering member 300 may be installed in the vent hole H1 of the module case 200. The filtering member 300 may be configured to filter foreign matter from flowing from the exterior space of the module case 200 to the interior space of the module case 200 through the vent hole H1. Furthermore, the filtering member 300 may be configured to allow air and vent gas to pass through but not allow other foreign matter to pass through.

[0048] In particular, the filtering member 300 may be configured to block foreign matter such as moisture, humidity, dust, and the like above a certain level. The vent hole H1 may be configured to penetrate between the interior and exterior of the module case 200, and the filtering member 300 blocks the vent hole H1 to prevent moisture, dust, and the like from the outside of the battery module from entering the module case 200 through the vent hole H1. The filtering member 300 may be any of a variety of waterproof filters or dustproof filters that are publicly known at the time of filing of the present application. The filtering member 300 may also be made of a variety of materials capable of blocking moisture, dust, and the like. For example, the filtering member 300 may be made of fiber, ceramic material, naphthalene, or the like.

[0049] The mesh member 400 may be configured in a mesh shape. Here, the mesh may be configured in a shape that is roughly plate-like but has a number of mesh holes formed therein. For example, the mesh member 400 may be configured in a shape in which a number of wires are woven like a net. Alternatively, the mesh member 400 may be configured in a shape in which a number of mesh holes are perforated in a plate. In particular, the mesh member 400 may be configured to allow gas to pass through the mesh holes but prevent flames, sparks, etc. from passing through.

[0050] The mesh member 400 may be made of a metal material. For example, the mesh member 400 may be woven with a number of metal wires. In particular, the mesh member 400 may be made of a metal material such as stainless steel (SUS) to prevent corrosion due to moisture. In addition, the mesh member 400 may be made of a variety of materials and have a variety of other shapes.

[0051] A plurality of mesh members 400 may be provided. In particular, mesh members 400 may be provided on both sides of the filtering member 300. That is, at least two mesh members 400 may be provided, one on the inside of the filtering member 300 and one on the outside of the filtering member 300, with the filtering member 300 at the center. In this case, the filtering member 300 can be said to be located between the multiple mesh members 400.

[0052] Furthermore, when two or more filtering members 300 are provided, a plurality of mesh members 400 may be provided for each filtering member 300. For example, two mesh members 400 may be located on both sides of each filtering member 300.

[0053] According to this embodiment of the present invention, the safety of the battery module can be improved from various aspects.

[0054] First, in the above-described embodiment, the module case 200 is formed with one or more vent holes H1, so that when vent gas is generated inside the battery module due to thermal runaway or the like, it can be quickly discharged to the outside of the battery module. This prevents the battery module from exploding or being damaged due to an increase in the internal pressure of the battery module. Furthermore, according to the above-described embodiment, the vent gas can be discharged in the intended direction through the vent holes H1. This prevents the vent gas from traveling in an unintended direction, which could lead to a fire or the spread of thermal runaway outside the battery module.

[0055] Furthermore, in the above-described embodiment, the filtering member 300 ensures that the battery module has a certain level of ingress protection (IP) performance. In particular, even if foreign matter such as moisture, humidity, or dust is present on the outside of the battery module when the battery module is in a normal state with no particular problems, the filtering member 300 can prevent such foreign matter from flowing into the interior of the battery module. For example, in the case of a battery module installed in a car, there is a risk that water will flow into the interior of the module case 200 through the vent hole H1 when it rains or when water splashes up on the road while driving. However, according to the above-described embodiment, the filtering member 300 can prevent water from flowing in through the vent hole H1.

[0056] Furthermore, in the above-described embodiment, the battery module can stably ensure the blocking performance against the emission of flames and the like by the multi-mesh member 400. In particular, if an abnormal state occurs inside the battery module due to a thermal event such as thermal runaway, flames, sparks, high-temperature active material particles, and the like may be ejected along with vent gas. The mesh member 400 can prevent such ignition sources (hereinafter referred to as flames, etc.) such as flames, sparks, and active material particles from being ejected from the inside of the module case 200 to the outside. In particular, in the above-described embodiment of the present invention, the mesh member 400 can be provided in multiple layers in the vent hole H1. Therefore, the multi-mesh member 400 can more effectively suppress flames and the like.

[0057] Furthermore, in the above-described embodiment, the filtering member 300 is interposed between the multiple mesh members 400, so that the position of the filtering member 300 can be stably maintained. For example, gas may flow in and out between the outside and inside of the battery module through the vent hole H1. In this case, the filtering member 300 can be stably positioned without coming off the vent hole H1 despite the pressure caused by the gas flow. Furthermore, according to this aspect of the present invention, structures and processes for fixing the filtering member 300 to the vent hole H1 can be omitted or reduced.

[0058] In particular, the filtering element 300 is provided to ensure waterproof and dustproof properties under normal conditions and may be vulnerable to flames and high temperatures. For example, the filtering element 300 may have a hole diameter equal to or larger than the hole diameter of the vent hole H1 under normal conditions, but may lose volume or at least partially disappear under high temperature conditions, resulting in a smaller size than the vent hole H1. Therefore, when high-temperature vent gas or a fire occurs inside the battery module, the fixing force to the filtering element 300 may weaken or be lost. Furthermore, the filtering element 300 may be combusted by the high-temperature vent gas or a fire. If the filtering element 300 is ejected outside the battery module during combustion, it may cause a fire in other components outside the battery module, such as other battery modules or a battery management system (BMS).

[0059] However, according to the above embodiment, even if the volume or shape of the filtering member 300 changes, the mesh members 400 located on both sides allow the filtering member 300 to remain positioned in the vent hole H1. Furthermore, according to the above embodiment, the filtering member 300 is prevented from being discharged to the outside of the battery module during combustion, thereby preventing the filtering member 300 from acting as a ignition source outside the battery module.

[0060] The mesh member 400 may be configured to have a diameter larger than the diameter of the vent hole H1. In this case, the mesh member 400 may be fixed to the module case 200 via a portion larger than the vent hole H1. For example, the mesh member 400 may be joined to the module case 200 by applying an adhesive to a portion not facing the vent hole H1 or by providing a hook or bolt fastening component. In this case, even when gas flows in and out through the vent hole H1, the mesh member 400 can be prevented from being sucked into the vent hole H1 due to the pressure of the gas.

[0061] As shown in FIG. 2 , the cell assembly 100 may include a plurality of pouch-type secondary batteries. The pouch-type secondary batteries may be configured to be erected vertically (up and down, Z-axis direction) and stacked horizontally, for example, left and right (X-axis direction). That is, the pouch-type secondary batteries may be erected with the wide surfaces of the receiving compartments accommodating the electrode assemblies facing left and right, and stacked with the wide surfaces of the receiving compartments facing each other. Each battery cell may include electrode leads, which may be located at both ends or one end of each battery cell. A secondary battery with electrode leads protruding in both directions may be called a bidirectional cell, and a secondary battery with electrode leads protruding in one direction may be called a unidirectional cell. The present invention is not limited by the specific type or shape of the secondary battery. Various types of secondary batteries already known at the time of filing of the present invention may be used in the cell assembly 100 of the present invention.

[0062] In such an embodiment, the vent hole H1 may be formed on at least one of the front and rear sides of the module case 200.

[0063] 2, the vent hole H1 may be formed in the front of the module case 200. The vent hole H1 may also be located in the upper portion of the module case 200 in the vertical direction (center portion). For example, the vent hole H1 may be formed in the upper end of the front side of the module case 200.

[0064] In this embodiment, the vent gas can be discharged to the outside through a vent hole H1 formed on the front upper side of the module case 200. Such a gas discharge configuration is shown in FIG.

[0065] FIG. 3 is a diagram schematically illustrating a cross-sectional configuration of a portion of a battery module according to an embodiment of the present invention.

[0066] 3 shows a configuration in which, when vent gas is generated inside the battery module, the vent gas is discharged to the outside through the vent hole H1. In particular, when vent gas is discharged from any one of the battery cells 110 included in the cell assembly 100, the vent gas may move upward inside the module case 200 as indicated by the arrow due to its high temperature characteristics. Furthermore, inside the battery cell 110, the gas is likely to move upward and be discharged through the seal located at the upper side. Therefore, the vent gas may be discharged to the upper side of the battery cell 110. Then, the vent gas that moves upward inside the module case 200 or is discharged to the upper side may move generally horizontally, i.e., forward, and be discharged to the outside through the vent hole H1.

[0067] According to the above-described embodiment, vent gas can be more quickly and smoothly discharged from the interior of the module case 200. Furthermore, when the electrode leads of each battery cell are located at the front side of the interior space of the module case 200, there may be a larger space at the front side compared to other parts. Therefore, the vent gas tends to flow toward the front of the cell assembly 100. Therefore, when the vent hole H1 is located at the front side of the cell assembly 100 as in the above-described embodiment, the vent gas can be more smoothly and quickly discharged.

[0068] Meanwhile, in the embodiment of FIG. 2 , the vent hole H1 may also be formed at the rear of the module case 200. That is, the vent hole H1 may be formed at both the front and rear of the module case 200. In particular, when the electrode leads of each battery cell are located at both the front and rear sides of the cell assembly 100, it is preferable that the vent hole H1 be formed at both the front and rear. In this case, vent gas located inside the module case 200, particularly at the upper side, can be discharged to both the front and rear sides of the module case 200. Therefore, in this case, more rapid discharge of the vent gas is possible. Furthermore, the vent gas may be generated and ejected at either the front or rear side of the cell assembly 100. Therefore, according to the above embodiment, whether the vent gas is ejected from the front or rear of the cell assembly 100, more rapid discharge of the vent gas is possible.

[0069] The module case 200 may have a mounting groove formed therein to mount the mesh member 400. This will be described in more detail with reference to the configuration of FIG.

[0070] FIG. 4 is an exploded perspective view schematically illustrating a configuration of a portion of a battery module according to an embodiment of the present invention.

[0071] 4, a mounting groove, such as a portion indicated by G1, may be formed in the module case 200. In particular, the mounting groove G1 may be positioned around the portion of the module case 200 where the vent hole H1 is formed. That is, the mounting groove G1 may be formed to be wider than the vent hole H1.

[0072] The mounting groove G1 may be configured to have a shape that allows the mesh member 400 to be fitted therein. For example, as shown in FIG. 4, the mounting groove G1 may be formed on the outer surface of the module case 200. In this case, the mounting groove G1 may be formed to have a shape recessed inward (in the +Y-axis direction). The mesh member 400 located outside the filtering member 300 may be fitted into this outer mounting groove G1. The mounting groove G1 may also be formed on the inner surface of the module case 200. In this case, the mounting groove G1 may be formed to have a shape recessed outward (in the -Y-axis direction) on the inner surface of the module case 200. The mesh member 400 located inside the filtering member 300 may be fitted into this inner mounting groove.

[0073] According to this embodiment of the present invention, the mounting groove G1 can improve the bonding strength between the mesh member 400 and the module case 200. In particular, according to the above embodiment, the mounting groove G1 can support the mesh member 400 in an upward direction. Furthermore, if the size of the mounting groove G1 is configured to be approximately the same as the size of the mesh member 400, the mesh member 400 can be fitted into the mounting groove G1. In addition, according to the above embodiment, the mounting groove G1 can improve the ease of assembly of the mesh member 400. In particular, since the mounting position of the mesh member 400 is limited to the mounting groove G1, the assembly process of the mesh member 400 can be easily guided. Furthermore, in the above embodiment, an adhesive can be applied to the mounting groove G1 to stably bond the mesh member 400 to the mounting groove G1.

[0074] A plurality of vent holes H1 may be formed in one battery module. Furthermore, a plurality of vent holes H1 may be formed on one side surface of the battery module. For example, as shown in FIG. 4, a plurality of vent holes H1 may be formed on the front side of the battery module.

[0075] The plurality of vent holes H1 may be formed in the horizontal direction. In particular, the plurality of vent holes H1 may be aligned in the stacking direction of the cell assembly 100. For example, in the configuration of FIG. 4, the plurality of battery cells 110 may be stacked in the left-right direction (X-axis direction), and the plurality of vent holes H1 may be formed in a shape spaced apart from each other by a predetermined distance in the left-right direction. More specifically, the number of vent holes H1 may be equal to or greater than the number of battery cells 110 included in the cell assembly 100 on the front side of the battery module.

[0076] According to this aspect of the present invention, the vent gas emitted from the cell assembly 100 can be more quickly and smoothly discharged to the outside of the module case 200. Furthermore, the vent hole H1 may be formed on multiple sides of the battery module, for example, on both the front and rear sides. In this case, the discharge performance of the vent gas through the vent hole H1 can be further improved.

[0077] When a plurality of vent holes H1 are formed in the module case 200, a filtering member 300 may be separately provided for each vent hole H1. In this case, it can be said that a plurality of filtering members 300 are provided in one battery module.

[0078] The plurality of vent holes H1 may be configured such that at least two of them have different diameters. For example, the plurality of vent holes H1 may be formed in the left-right direction, and the diameter of the vent holes H1 located in the center may be larger than the diameter of the vent holes H1 located on the outer sides of the left and right sides. In particular, the plurality of vent holes H1 formed in the horizontal direction may be formed such that the diameters of the vent holes H1 gradually increase toward the center.

[0079] According to this embodiment of the present invention, it is possible to induce more vent gas to be discharged to a specific location, for example, the center. Furthermore, within the battery module, more vent gas is likely to be located in the center than in the left and right directions. Therefore, by increasing the diameter of the vent hole H1 in the center, as in the above embodiment, even if more vent gas accumulates in the center, it is possible to discharge the gas more quickly and smoothly.

[0080] In the above-described embodiment, the mounting groove G1 may be formed in a shape elongated in the horizontal direction. For example, as shown in Fig. 4, the mounting groove G1 may be formed in a shape elongated in the left-right direction (X-axis direction). The mesh member 400 may be formed in a shape elongated in the horizontal direction (left-right direction) corresponding to the shape of the mounting groove G1.

[0081] In particular, the mounting groove G1 may be configured to cover a plurality of vent holes H1 formed on one side of the battery module. For example, if five vent holes H1 are arranged in the left-right direction on the front side of the battery module, the mounting groove G1 may be formed elongated in the left-right direction so that all five vent holes H1 are located inside. That is, all five vent holes H1 formed on the upper front side of the module case 200 may be formed in one mounting groove G1.

[0082] According to this embodiment of the present invention, a plurality of vent holes H1 can be covered with a small number of mesh members 400. This further improves the ease of assembly and productivity of the battery module. Furthermore, according to the above embodiment, the bonding area between the mesh member 400 and the mounting groove G1 is increased, thereby improving the bonding strength and fixing force of the mesh member 400.

[0083] The filtering member 300 may be configured so that at least a portion thereof is fitted into the vent hole H1, which will be described in more detail with reference to FIG.

[0084] 5 is an enlarged schematic cross-sectional view of a portion of a battery module according to an embodiment of the present invention, where a vent hole H1 is formed. For example, FIG. 5 shows an example of a cross-sectional configuration taken along line A1-A1' in FIG.

[0085] 5, a vent hole H1 having a shape penetrating in an inward-outward direction (Z-axis direction) is formed in the module case 200, and the filtering member 300 may be attached so that its entire portion is fitted into the vent hole H1. In this case, the filtering member 300 may be configured to correspond to the shape and diameter of the vent hole H1. For example, if the vent hole H1 is formed in a circular shape, the filtering member 300 may be formed in a circular shape and have an outer diameter that matches the inner diameter of the vent hole H1. In this configuration, the mesh member 400 may be provided on both the inside and outside of the filtering member 300.

[0086] According to this embodiment of the present invention, it is possible to eliminate or reduce the space occupied by the filtering member 300 inside and outside the battery module or the connecting structure for mounting the filtering member 300. In addition, in this case, the configuration for mounting the mesh member 400 in the mounting groove G1 can be more easily realized without being obstructed by the filtering member 300.

[0087] 6 and 7 are cross-sectional views schematically illustrating the cross-sectional configuration of a portion of a battery module according to different embodiments of the present invention. Regarding these embodiments and other embodiments included in this specification, detailed descriptions of parts that are the same or similar to those described in other embodiments will be omitted, and the description will focus on parts that are different.

[0088] First, referring to FIG. 6 , the filtering member 300 may be configured to be partially inserted into the vent hole H1. That is, a portion of the filtering member 300 may be inserted into the vent hole H1, while another portion may not. In particular, in the configuration of FIG. 6 , a portion of the filtering member 300 may be formed larger than the diameter of the vent hole H1, as shown by B1 and B1′, and may be configured to be positioned outside the vent hole H1 without being inserted therein. In particular, the portion of the filtering member 300 that is larger than the vent hole H1 may be configured to be positioned inward (in the +Y-axis direction in the drawing) from the vent hole H1. That is, in the filtering member 300 shown by B1 and B1′ in FIG. 6 , the large-area portion exposed to the outside may be positioned inside the module case 200.

[0089] According to this embodiment of the present invention, the filtering element 300 can be more stably positioned in the vent hole H1 when gas flows in and out through the vent hole H1. In particular, if a thermal event occurs and vent gas is discharged to the outside through the vent hole H1, the filtering element 300 may be subjected to strong outward pressure due to the pressure of the vent gas. However, the configuration shown in FIG. 6 more effectively prevents the filtering element 300 from being discharged to the outside of the vent hole H1.

[0090] 7, the vent hole H1 may have a portion whose hole diameter varies from the inside to the outside. The filtering member 300 may have a portion whose hole diameter varies from the inside to the outside to correspond to the shape of the vent hole H1. In particular, when the vent hole H1 is formed in a circular shape, the vent hole H1 may be configured so that its inner diameter gradually decreases from the inside to the outside. The filtering member 300 may be configured so that its outer diameter gradually decreases from the inside to the outside.

[0091] According to this embodiment of the present invention, movement of the filtering member 300 can be suppressed during gas discharge, similar to the embodiment of Fig. 6. Furthermore, according to the embodiment of Fig. 7, the filtering member 300 can be entirely positioned only within the vent hole H1, which is advantageous for reducing the volume of the battery module, improving the energy density, and simplifying the structure.

[0092] Fig. 8 is a perspective view schematically illustrating a configuration of a portion of a battery module according to yet another embodiment of the present invention. Fig. 9 is a cross-sectional view illustrating a cross-sectional configuration of a portion of a battery module according to yet another embodiment of the present invention. For example, Fig. 9 can be considered to be an example of a cross-sectional configuration taken along line A2-A2' in Fig. 8.

[0093] 8 and 9, the module case 200 may include blocking portions B2 and B2'. In particular, the blocking portions B2 and B2' may be configured to prevent at least a portion of the mesh member 400 provided on the outside of the filtering member 300 from moving outward.

[0094] For example, in the configuration of FIG. 9 , the +Y-axis direction is the inward direction and the −Y-axis direction is the outward direction with respect to the filtering member 300. In this case, the mesh member 400 located inside the filtering member 300 is the inner mesh 401, and the mesh member 400 located outside the filtering member 300 is the outer mesh 402. Here, the module case 200 may have blocking portions as indicated by B2 and / or B2′ at the upper and / or lower ends of the portion where the outer mesh 402 is attached. In particular, the upper blocking portion indicated by B2 may be configured in a bent shape extending downward from the upper end of the outer portion of the outer mesh 402 to enclose the upper end of the outer portion of the outer mesh 402. Furthermore, the lower blocking portion indicated by B2′ may be configured in a bent shape extending upward from the lower end of the outer portion of the outer mesh 402 to enclose the lower end of the outer portion of the outer mesh 402.

[0095] According to this configuration of the present invention, the mesh member 400 can be more stably fixed to the module case 200, particularly to the mounting groove G1 of the module case 200. Furthermore, when vent gas is discharged to the outside through the vent hole H1, the outer mesh 402 may be subjected to a force that moves it outward. However, in the above-described embodiment, the blocking portions B2 and B2' prevent the outer mesh 402 from moving outward, thereby preventing the outer mesh 402 from coming off the module case 200. This allows the effects of the outer mesh 402, particularly its flame blocking effect, to be prolonged.

[0096] The blocking portions B2, B2' may be elongated in the horizontal direction. In particular, in the module case 200, the vent holes H1 may be arranged in the left-right direction (X-axis direction), and the mounting groove G1 in which the mesh member 400 is placed may also be elongated in the left-right direction. In this case, the blocking portions B2, B2' may be elongated in the left-right direction following the shape of the mounting groove G1. Furthermore, as shown in FIGS. 8 and 9, the blocking portions B2, B2' may be formed at the upper and lower ends of the mounting groove G1, respectively, and both the upper blocking portion B2 and the lower blocking portion B2' may be elongated and extend from the left end to the right end of the mounting groove G1.

[0097] According to this embodiment of the present invention, the fixing force of the mesh member 400 can be further increased. Furthermore, in this case, the assembly of the mesh member 400 can be improved. In particular, according to the above embodiment, the outer mesh 402 of the mesh member 400 can be slidably coupled to the outer surface of the module case 200. For example, as shown by arrow A3 in the configuration of FIG. 8 , the mesh member 400 can be fitted into the mounting groove G1 and the left ends of the blocking portions B2 and B2', and then moved rightward to be slidably coupled to the module case 200. At this time, the blocking portions B2 and B2' can guide the sliding coupling of the mesh member 400.

[0098] In this manner, the module case 200, particularly the mounting groove G1 and the blocking portions B2 and B2', may be configured to allow the mesh member 400 to be slidably coupled to the mounting groove G1, thereby improving both the fixation and assembly properties of the mesh member 400.

[0099] 10 is a diagram illustrating a cross-sectional configuration of a portion of a battery module according to yet another embodiment of the present invention, viewed from above. For example, Fig. 10 can be said to be a modified example of the cross section taken along line A4-A4' in Fig. 8.

[0100] Referring to FIG. 10 , a blocking portion, as shown by B2′, is formed where the outer mesh 402 is attached, and at least a portion of the blocking portion may be configured to be spaced a predetermined distance horizontally (in the Y-axis direction) from the outer mesh 402. In particular, the blocking portion B2′ extends elongatedly in the left-right direction (in the X-axis direction), but may be configured so that the distance from the outer mesh 402 varies in parts. Furthermore, as shown in FIG. 10 , the central portion of the blocking portion B2′ may be configured to be spaced further from the outer mesh 402 in the left-right direction than the left and right ends of the blocking portion B2′. For example, when the distance between the blocking portion B2′ and the outer mesh 402 at the central portion is C1 and the distance at the left end is C2, the blocking portion B2′ may be configured so that the relationship C1 > C2 holds. In particular, the blocking portion B2′ may be formed in an arch shape that protrudes further outward from the left and right ends toward the central portion.

[0101] According to this embodiment of the present invention, the separation space between the blocking portion B2' and the mesh member 400 can further reduce the pressurizing force of the vent gas applied to the mesh member 400. In particular, a large amount of vent gas may be discharged from the center portion, but if the separation distance of the center portion is configured to be longer as in the above embodiment, the center portion of the outer mesh 402 may move relatively far to the outside where the blocking portion B2' is located. Therefore, in this case, it is possible to prevent a relatively strong force from being applied to the center portion of the outer mesh 402, thereby further reducing the possibility of damage or breakage of the outer mesh 402, the blocking portion B2', etc.

[0102] Furthermore, according to this embodiment, when the vent gas is discharged, the blocking portion B2' allows the outer mesh 402 to assume an arch shape with the central portion protruding outward. In this case, the flow direction of the vent gas discharged through the outer mesh 402 is formed radially, thereby dispersing the vent gas in a wider direction.

[0103] The plurality of mesh members 400 may include at least two mesh members 400 having mesh holes with different hole diameters.

[0104] For example, as described above, the mesh member 400 may include an inner mesh 401 located inside the filtering member 300 and an outer mesh 402 located outside the filtering member 300. In this case, the inner mesh 401 and the outer mesh 402 may be configured so that the pore sizes of the mesh holes are different from each other.

[0105] In particular, the inner mesh 401 may be configured with larger mesh hole diameters than the outer mesh 402. With this configuration, when vent gas is discharged, particles with relatively larger diameters are filtered out by the inner mesh 401, and particles with relatively smaller diameters are filtered out by the outer mesh 402. Therefore, particles discharged together with the vent gas can be filtered into a dispersed form according to their diameters by the inner mesh 401 and the outer mesh 402. This improves the effect of blocking discharged particles by the multiple meshes, while preventing the problem of a large number of particles getting caught only in the inner mesh 401.

[0106] 11 is a cross-sectional view schematically illustrating a cross-sectional configuration of a portion of a battery module according to yet another embodiment of the present invention, for example, FIG. 11 can be said to be another example of a cross-sectional configuration taken along line A2-A2′ in FIG.

[0107] 11, at least some of the multiple mesh members 400 may have needle-shaped bodies. Such needle-shaped bodies may be formed to protrude inward or outward. More specifically, in the embodiment of FIG. 11, the inner mesh 401 and the outer mesh 402 may have needle-shaped bodies that protrude sharply inward (+Y-axis direction), as shown by S1 and S2.

[0108] According to this embodiment of the present invention, when the vent gas passes through the inner mesh 401 and / or the outer mesh 402, the active material particles and the like contained in the vent gas are caught on the needle-shaped bodies S1 and S2, thereby more effectively preventing the active material particles and the like from passing through the mesh member 400.

[0109] Furthermore, at least one needle-shaped member in the mesh member 400, for example, needle-shaped member S2 of the outer mesh 402, may be fitted into the filtering member 300. In this case, the position of the filtering member 300 can be more firmly fixed by the needle-shaped member S2 of the mesh member 400. In addition, in this case, the shape of the filtering member 300 can be more stably maintained even when vent gas is discharged.

[0110] 11, both the inner mesh 401 and the outer mesh 402 have needle-shaped structures that face inward, but some of them may have needle-shaped structures that face outward. For example, the inner mesh 401 may have needle-shaped structures S1 that protrude sharply outward, facing the filtering member 300. In this case, the needle-shaped structures S1 of the inner mesh 401 may be inserted into the filtering member 300. This embodiment allows the position and shape of the filtering member 300 to be more stably maintained or fixed when gas flows in and out.

[0111] Furthermore, the needle-like members of the mesh member 400 may be fitted into the module case 200. For example, as shown in the embodiment of Fig. 11, some of the needle-like members S2 formed on the outer mesh 402 may be configured to be fitted into the outer surface of the module case 200. In this case, the bonding strength between the mesh member 400 and the module case 200 can be further improved. In particular, the mesh member 400 can be more reliably prevented from coming off when vent gas is discharged.

[0112] At least two of the mesh members 400 may be configured so that mesh holes are formed at different positions to intersect with each other, as will be described in more detail with reference to FIG.

[0113] 12 is a cross-sectional view schematically illustrating a cross-sectional configuration of a portion of a battery module according to yet another embodiment of the present invention. For example, FIG. 12 can be said to be yet another example of a cross-sectional configuration taken along line A2-A2′ in FIG. 8.

[0114] 12, the inner mesh 401 and the outer mesh 402 may have mesh holes formed at different positions in the vertical direction (Z-axis direction). In particular, the inner mesh 401 may be configured in the shape of a plate with a mesh hole MH1 formed on the upper side and no mesh hole formed on the lower side. Furthermore, the outer mesh 402 may be configured in the shape of a plate with a mesh hole MH2 formed on the lower side and no mesh hole formed on the upper side.

[0115] According to this embodiment of the present invention, the vent gas passing through mesh holes MH1 of inner mesh 401 and mesh holes MH2 of outer mesh 402 can flow in a shape that is at least partially bent, as shown by the arrows in Figure 12. In this case, since flames, sparks, etc. that are contained in the vent gas and flow tend to travel in a straight line, the effect of preventing the flames, sparks, etc. from being emitted to the outside can be further improved.

[0116] Furthermore, when the mesh holes MH2 of the outer mesh 402 are configured to be lower than the mesh holes MH1 of the inner mesh 401, as in the above embodiment, the effect of preventing the discharge of flames and the like can be further improved. That is, when the discharge passage is configured to gradually become lower as it proceeds from the inside to the outside of the vent hole H1, as in the above embodiment, the height of the vent gas decreases as it is discharged to the outside. In this case, because flames and sparks have a tendency to move upward, it becomes more difficult for them to pass through the inner mesh 401 and the outer mesh 402 and be discharged to the outside.

[0117] Meanwhile, various other methods can be used to change the shape or layout of the mesh holes to make the flow of vent gas passing through the inner mesh 401 and the outer mesh 402 bent rather than straight. For example, the layout of the mesh holes formed in the inner mesh 401 and the outer mesh 402 can be made different from each other in the left-right direction. Alternatively, the shape of the mesh hole MH1 formed in the inner mesh 401 and the shape of the mesh hole MH2 formed in the outer mesh 402 can be made different from each other, so that the flow of vent gas passing through the inner mesh 401 and the outer mesh 402 is bent.

[0118] 1 and 2, the module case 200 may include a lower frame 210 and an upper cover 220. Here, the lower frame 210 may be configured with an open upper end, and the upper cover 220 may be coupled to the open upper end of the lower frame 210. For example, the lower frame 210 may be configured in the shape of a U-frame having a bottom and side portions. In this case, the U-frame may be said to be a frame having a U-shape in which the bottom and two side portions are manufactured in an integrated shape.

[0119] In such a configuration, the upper cover 220 may be welded to at least a portion of the lower frame 210. For example, if the lower frame 210 is configured in a U-frame shape, the left and right ends of the upper cover 220 may be welded to the upper ends of the sides of the lower frame 210.

[0120] Meanwhile, when the lower frame 210 is configured in a U-frame shape, the end frame 230 may be coupled to the front and rear openings. In this case, the front and rear ends of the upper cover 220 may be welded to the upper end of the end frame 230. Here, a vent hole H1 may be formed on the upper side of the end frame 230. Therefore, the filtering member 300 and the mesh member 400 may be attached to such an end frame 230.

[0121] In such a configuration of the module case 200, the upper cover 220 may have a blocking protrusion, which will be described in more detail with reference to FIGS.

[0122] Fig. 13 is a diagram schematically illustrating a cross-sectional configuration of a portion of a battery module according to an embodiment of the present invention, and Fig. 14 is an enlarged view of part A5 in Fig. 13.

[0123] 13 and 14, the upper cover 220 may have a blocking protrusion, as indicated by P1, at an end portion thereof that is coupled to the lower frame 210. Here, the blocking protrusion P1 may be configured to protrude downward. More specifically, as shown in FIGS. 13 and 14, the blocking protrusion P1 may be configured to protrude downward at the left end portion of the upper cover 220. Although not shown, the blocking protrusion P1 may also be configured to protrude downward at the right end portion of the upper cover 220.

[0124] The blocking protrusion P1 may be provided in an elongated shape extending along the joining portion between the upper cover 220 and the lower frame 210. For example, the blocking protrusion P1 may be provided in an elongated shape extending from the left end and the right end of the upper cover 220 along the front-rear direction (Y-axis direction).

[0125] According to this embodiment of the present invention, the bonding strength and sealing strength of the joint portion between the upper cover 220 and the lower frame 210 can be improved and stably maintained. For example, if high-temperature vent gas or flame is ejected from the cell assembly 100, the blocking protrusion P1 can block the high-temperature vent gas or flame from directly heading toward the joint portion between the upper cover 220 and the lower frame 210. Therefore, according to this embodiment, the welded portion between the upper cover 220 and the lower frame 210 is prevented from becoming brittle. Furthermore, according to the above embodiment, it is possible to prevent high-temperature vent gas or flame from leaking into a weakly welded or unwelded portion between the upper cover 220 and the lower frame 210.

[0126] The upper cover 220 may also include a sealant, such as the portion indicated by E1 in FIG. 14. The sealant E1 may be configured to enclose at least a portion of the blocking protrusion P1. For example, the sealant E1 may be configured to enclose the sides and bottom of the blocking protrusion P1. In particular, the sealant E1 may be configured to seal the space between the blocking protrusion P1 and the lower frame 210.

[0127] Here, the sealing material E1 may be made of a material with higher elasticity than the blocking protrusion P1. In particular, the blocking protrusion P1 may be made of a metal material such as Al, which is the material of the module case 200, but the sealing material E1 may be made of a material with better elasticity than such a metal material. For example, the sealing material E1 may be made of a plastic material.

[0128] In particular, the sealing material E1 may be made of a material that is difficult to burn even in the presence of high-temperature vent gases or flames, such as a non-flammable, semi-non-flammable, or flame-retardant material. For example, the sealing material E1 may include a heat-resistant plastic, a semi-non-flammable urethane foam, a ceramic material, or the like.

[0129] According to this embodiment of the present invention, the sealant E1 can more reliably block the movement of high-temperature vent gas, flames, and the like to the joining portion between the upper cover 220 and the lower frame 210. Therefore, it is possible to more reliably prevent the vent gas from leaking to other portions except for the vent hole H1. It is also possible to prevent flames and the like from leaking into the gap between the upper cover 220 and the lower frame 210. Furthermore, according to the above embodiment, it is possible to prevent the welded portion or joining portion between the upper cover 220 and the lower frame 210 from becoming brittle.

[0130] 15 is a diagram schematically illustrating a cross-sectional configuration of a portion of a battery module according to another embodiment of the present invention. For example, Fig. 15 can be said to be a modified example of the portion A5 in Fig. 13.

[0131] 15, a blocking protrusion P1 is provided on the upper cover 220, and the blocking protrusion P1 may be configured to be inclined at a predetermined angle from the vertical direction on the upper cover 220 rather than being vertical on the upper cover 220. In particular, the blocking protrusion P1 may be configured to be in a shape that protrudes downward from the lower surface of the upper cover 220, and may be configured to be in a shape that gradually approaches the lower frame 210 as it moves downward.

[0132] According to this embodiment of the present invention, the blocking effect of the blocking protrusion P1 on vent gas and flame can be further improved. For example, even if vent gas or flame occurs on the cell assembly 100 side and moves along the underside of the upper cover 220 toward the left end, the vent gas or flame can be directed downward along the slope of the blocking protrusion P1 formed on the left end of the upper cover 220, as shown by the arrow in Fig. 15. This further reduces the possibility of vent gas or flame heading toward the joining portion (welded portion) between the upper cover 220 and the lower frame 210, as shown by A6 in Fig. 15.

[0133] Furthermore, in the above-described embodiment, the lower end of the blocking protrusion P1 may contact the inner surface of the lower frame 210. In this case, the blocking protrusion P1 can further improve its effectiveness in preventing the leakage of vent gas and flames. Also, in the embodiment of FIG. 15, a sealant may be provided on at least a portion of the blocking protrusion P1. In particular, in the embodiment of FIG. 15, a sealant may be filled between the left side surface of the blocking protrusion P1 and the connection portion indicated by A6, thereby improving sealing force.

[0134] A battery pack according to the present invention may include one or more of the above-described battery modules according to the present invention. In addition to the battery module, the battery pack according to the present invention may further include various other components, such as a battery management system (BMS), bus bars, a pack case, a relay, a current sensor, and other battery pack components that are known at the time of filing of the present invention.

[0135] The battery module according to the present invention may be applied to automobiles such as electric vehicles and hybrid vehicles. That is, the automobile according to the present invention may include the battery module according to the present invention or the battery pack according to the present invention. Furthermore, the automobile according to the present invention may further include various other components included in the automobile in addition to the battery module or battery pack. For example, the automobile according to the present invention may further include a vehicle body, a motor, a control device such as an electronic control unit (ECU), etc. in addition to the battery module according to the present invention.

[0136] Meanwhile, although directional terms such as up, down, left, right, front, and back can be used in this specification, it will be obvious to those skilled in the art of the present invention that these terms are used merely for ease of explanation and may differ depending on the position of the object in question, the position of the observer, etc.

[0137] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited to these, and it goes without saying that various modifications and variations can be made by a person having ordinary knowledge in the technical field to which the present invention pertains within the technical spirit of the present invention and the scope of equivalents of the claims. [Explanation of symbols]

[0138] 100: Cell assembly 110: Battery cell 200:Module case 210: Lower frame 220: Top cover 230: End Frame 300: Filter ring material 400: Mesh material 401: Inner mesh 402: Outer mesh H1: Vent hole G1: Mounting groove B2, B2': Blocking part P1: Cut-off protrusion S1, S2: needle-like body E1: Sealing material

Claims

1. a cell assembly including one or more battery cells; a module case that houses the cell assembly in an internal space and has a vent hole formed therein so that gas in the internal space can be discharged to the outside; a filtering member provided in the vent hole of the module case and configured to filter foreign matter from flowing from an external space into the internal space through the vent hole; A plurality of mesh members each configured in a mesh shape and provided on both sides of the filtering member; Including, A battery module, wherein at least some of the plurality of mesh members have needle-shaped bodies formed to protrude inward or outward.

2. The cell assembly is formed by stacking a plurality of pouch-type secondary batteries in a left-right direction in an upright state, The battery module according to claim 1 , wherein the vent hole is formed on at least one of the front and rear sides of the module case.

3. The battery module according to claim 1 , wherein the module case has a recessed mounting groove formed around the portion where the vent hole is formed, so that the mesh member can be fitted therein.

4. The battery module according to claim 3 , wherein a plurality of the vent holes are formed.

5. The battery module according to claim 4 , wherein the mounting groove is formed elongated in the horizontal direction.

6. The battery module according to claim 1 , wherein at least a portion of the filtering member is fitted into the vent hole.

7. 2. The battery module according to claim 1, wherein the module case includes a blocking portion configured to prevent at least a portion of a mesh member provided on the outside of the filtering member from moving outward.

8. The battery module according to claim 1 , wherein at least two of the plurality of mesh members have mesh holes with different hole diameters.

9. the module case includes a lower frame having an open upper end and an upper cover coupled to the open upper end of the lower frame; The battery module according to claim 1 , wherein the upper cover is welded to at least a portion of the lower frame.

10. The battery module according to claim 9 , wherein the upper cover has a blocking protrusion that protrudes downward at a portion where the upper cover is coupled to the lower frame.

11. The battery module according to claim 10 , wherein the upper cover includes a sealant configured to enclose the blocking protrusion.

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

13. A motor vehicle comprising a battery module according to any one of claims 1 to 11.

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