Vent device and battery package including same

Abstract

The present invention discloses a vent device and a battery package including the same, which includes a screen portion that blocks vent gas and changes the direction of the vent gas, a cooling plate having passage holes formed therein to allow the vent gas to pass through and dissipate heat from the vent gas, and a vent filter portion installed in the passage holes of the cooling plate to filter the vent gas changed in direction by the screen portion.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0026259, filed February 27, 2023, and all contents disclosed in the documents of this Korean Patent Application are incorporated herein by reference.

[0002] The present invention relates to a vent device that can prevent vent gas generated when a battery module ignites from directly colliding with a vent filter unit and prevent dust particles larger than the mesh of the vent filter unit from being discharged, thereby reducing the possibility of ignition, and a battery package including the same. [Background technology]

[0003] Typically, a secondary battery includes a positive electrode, a negative electrode, and an electrolyte, and generates electrical energy through a chemical reaction. The use of secondary batteries is gradually increasing due to their rechargeable / dischargeable characteristics. Among these secondary batteries, lithium secondary batteries, due to their high energy density per unit weight, are widely used as power sources for electronic and communication devices, as well as for driving high-power hybrid and electric vehicles.

[0004] In terms of the shape of these secondary batteries, there is an increasing demand for prismatic and pouch-type battery cells that are thin and can be applied to products such as mobile phones, etc. In terms of secondary battery materials, there is an increasing demand for lithium secondary batteries such as lithium-ion batteries and lithium-ion polymer batteries that have high energy density, discharge voltage, and output stability.

[0005] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these battery cells is approximately 2.5V to 4.2V. If a higher output voltage is required, a battery module is formed by connecting multiple battery cells in series, and a battery package is formed by connecting multiple battery modules. Furthermore, a battery package is formed by connecting multiple battery cells in parallel depending on the charge / discharge capacity required for the battery package. As a result, the number of battery cells and the electrical connection structure of the battery package can be variously set depending on the required output voltage or charge / discharge capacity.

[0006] It is important for battery packages containing multiple battery modules to easily dissipate heat generated in each battery module. Heat generated during the charging and discharging process of the battery package may not be effectively dissipated. In this case, heat accumulation occurs in the battery modules, which can accelerate deterioration of the battery modules. Accelerated deterioration of the battery modules can lead to fire or explosion of the battery modules. For this reason, high-power, large-capacity battery packages are equipped with cooling devices and safety devices to cool each battery module.

[0007] When thermal runaway occurs inside a battery module, a large amount of flammable gas is generated. Because the battery package inside the battery module is sealed from the outside, there is a lack of oxygen inside the battery package, so flames rarely occur.

[0008] When flammable vent gas inside a battery package is discharged to the outside, high-temperature dust may come into contact with air. If the dust contained in the high-temperature vent gas is larger than a certain size, the dust may act as an ignition point. To reduce the particle size of the dust contained in the vent gas, a filter is installed in the vent device, and the filter mesh is designed to be small to reduce the particle size of the dust discharged to the outside.

[0009] However, because a large amount of vent gas is discharged to the outside through the narrow outlet of the vent device, the flow rate and pressure of the vent gas increase significantly. When the high-velocity and high-pressure vent gas hits the filter, the filter mesh expands, allowing large particles of dust to pass through the filter and be discharged to the outside. This can increase the risk of the battery package catching fire.

[0010] The background technology of the present invention is disclosed in Korean Patent Publication No. 2022-0056024 (published on May 4, 2022, title of invention: Pack housing with integrated filter mesh applied to vent hole, and battery pack including the same). Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been devised to solve the above-mentioned problems, and aims to provide a vent device that can prevent flammable dust contained in vent gas from being discharged, and a battery package including the same.

[0012] The present invention aims to provide a vent device that can prevent flammable dust particles of a certain size or larger from coming into contact with external air and acting as an ignition point, and a battery package including the same.

[0013] An object of the present invention is to provide a vent device that can significantly reduce the pressure of vent gas acting on a vent filter portion, and a battery package including the same.

[0014] An object of the present invention is to provide a vent device that can prevent a vent filter portion from being deformed or damaged by the pressure of vent gas, and a battery package including the same.

[0015] An object of the present invention is to provide a vent device that can suppress the ignition of dust outside a battery package and prevent the occurrence of a fire, and a battery package including the same.

[0016] The present invention aims to provide a vent device that can improve heat dissipation performance by conducting thermal energy of vent gas to a case via a cooling body portion, and a battery package including the same.

[0017] The present invention aims to provide a vent device and a battery package including the same.

[0018] The technical object of the present invention is not limited to the above-mentioned objects, and other unmentioned objects and advantages of the present invention can be understood from the following description and can be more clearly understood from the examples of the present invention. Furthermore, it can be easily understood that the objects and advantages of the present invention can be achieved by the means and combinations thereof set forth in the claims. [Means for solving the problem]

[0019] The present invention can be applied to a vent device that is installed in a battery pack and filters vent gas from the battery pack, and to a battery package in which the vent device is installed.

[0020] The vent device of the present invention includes a plate having a passage hole formed therein to allow the vent gas to pass through, a screen portion arranged at a distance from the passage hole in a direction opposite to the direction in which the vent gas passes through the passage hole and blocking the passage hole in the passing direction, and a vent filter portion installed in the passage hole of the plate and filtering the vent gas passing through the passage hole.

[0021] The plate may be a cooling plate that receives and dissipates heat from the vent gas passing through the passage hole portion.

[0022] The screen portion may include a screen panel that blocks the passage hole portion, and a frame portion that supports the screen panel so as to be spaced apart from the plate.

[0023] The screen panel may be disposed so as to face the passage hole of the plate.

[0024] The edge of the screen panel and the plate may be spaced apart in the passing direction.

[0025] The frame portion may connect the screen panel and the plate.

[0026] The frame portion may form a bypass space between the screen panel and the plate.

[0027] The frame unit may include a front frame on which the screen panel is installed, a rear frame facing the front frame and spaced apart from it, and a connecting frame connecting the front frame and the rear frame.

[0028] The connecting frame may extend from the front frame toward the plate.

[0029] The rear frame may be fixed to the plate.

[0030] A plurality of the connection frames may be arranged at intervals along the periphery of the screen panel.

[0031] This allows a bypass space to be formed between the front frame and the plate.

[0032] The plate may include a body portion in which the through hole portion is formed, and a step portion formed around the periphery of the body portion and having a thickness smaller than that of the body portion.

[0033] The through holes of the plate may be formed in a lattice pattern.

[0034] The vent filter portion may include a first vent filter arranged inside the passage hole portion in the passage direction, and a second vent filter arranged outside the passage hole portion in the passage direction.

[0035] The screen portion, the vent filter portion, and the plate may be aligned along the passage direction.

[0036] The vent device according to the present invention includes a screen portion that blocks vent gas and changes the direction of travel of the vent gas, a cooling plate that has a passage hole formed therein to allow the vent gas to pass through and dissipate the heat of the vent gas, and a vent filter portion that is installed in the passage hole of the cooling plate to filter the vent gas that has been changed direction by the screen portion.

[0037] The screen portion may include a screen panel installed to block the vent gas, and a frame portion connecting the screen panel and the cooling plate to form a bypass space between the screen panel and the cooling plate.

[0038] The screen panel may be disposed so as to face the passage hole of the cooling plate.

[0039] The screen panel can divert the vent gas to the periphery of the frame portion.

[0040] The frame portion may include a front frame on which the screen panel is installed, a plurality of connecting frames extending toward the cooling plate side of the front frame and forming a bypass space between the front frame and the cooling plate, and a rear frame connected to the plurality of connecting frames, facing the front frame, and installed on the cooling plate.

[0041] The cooling plate may include a cooling body portion in which the through hole portion is formed, and a heat conduction promoting portion formed on the periphery of the cooling body portion and thinner than the cooling body portion.

[0042] The through holes of the cooling plate may be formed in a lattice pattern.

[0043] The vent filter portion may include a first vent filter disposed inside the passage hole portion, and a second vent filter disposed outside the passage hole portion.

[0044] The screen portion, the vent filter portion, and the cooling plate may be arranged in a straight line.

[0045] The battery package according to the present invention includes at least one battery module disposed inside a case; at least one internal filter unit disposed to seal the outside of the battery module and performing primary filtering of vent gas generated when the battery module ignites; and at least one vent device installed in the case, having a mesh that intercepts and diverts the vent gas filtered by the internal filter unit and performs secondary filtering of dust of an ignitable size from the vent gas filtered by the internal filter unit.

[0046] The vent device may include a screen portion facing the internal filter portion and blocking the vent gas to change the direction of travel of the vent gas, a cooling plate having a passage hole portion formed therein to allow the vent gas to pass through and to dissipate heat from the vent gas, and a vent filter portion installed in the passage hole portion of the cooling plate to filter the vent gas whose direction has been changed by the screen portion.

[0047] The internal filter units may be disposed on both sides of the battery module in a width direction, and the vent devices may be coupled to both sides of the case so as to face the internal filter units.

[0048] At least two of the vent devices may be installed on each side of the case.

[0049] The screen portion may include a screen panel installed between the internal filter portion and the cooling plate so as to block the vent gas, and a frame portion connecting the screen panel and the cooling plate to form a bypass space portion between the screen panel and the cooling plate.

[0050] The screen panel may be disposed so as to face the passage hole of the cooling plate.

[0051] The screen panel can divert the vent gas to the periphery of the frame portion.

[0052] The frame portion may include a front frame on which the screen panel is installed, a plurality of connecting frames extending toward the cooling plate side of the front frame and forming a bypass space between the front frame and the screen panel, and a rear frame connected to the plurality of connecting frames, facing the front frame, and installed on the cooling plate.

[0053] The cooling plate may include a cooling body portion in which the through hole portion is formed, and a heat conduction promotion portion formed around the periphery of the cooling body portion with a thickness thinner than the cooling body portion and connected to the case so as to make surface contact with the case.

[0054] The through holes of the cooling plate may be formed in a lattice pattern.

[0055] The vent filter portion may include a first vent filter disposed inside the passage hole portion, and a second vent filter disposed outside the passage hole portion.

[0056] The screen portion, the vent filter portion, and the cooling plate may be arranged in a straight line. [Effects of the Invention]

[0057] According to the present invention, the vent device intercepts and diverts the vent gas filtered by the internal filter unit, and performs secondary filtration of ignitable dust particles from the vent gas filtered by the internal filter unit. This prevents ignitable dust particles contained in the vent gas from being discharged. Furthermore, it prevents ignitable dust particles of a certain size or larger from coming into contact with external air and acting as an ignition point.

[0058] According to the present invention, the vent gas reaches the vent filter section after being redirected by the screen section, so that the pressure of the vent gas acting on the vent filter section can be significantly reduced.

[0059] According to the present invention, the pressure of the vent gas is significantly reduced, preventing the mesh of the vent filter unit from expanding (expanding) due to the pressure of the vent gas, thereby preventing dust particles larger than the mesh of the vent filter unit from being discharged through the vent filter unit.

[0060] According to the present invention, dust particles of a size that can be complexed are filtered by the vent filter portion, so that ignition of the dust particles outside the battery package can be suppressed, thereby suppressing the occurrence of a fire.

[0061] According to the present invention, the thermal contact area between the cooling plate and the case is increased, and therefore the thermal energy of the vent gas is conducted to the case via the cooling body portion, thereby improving the heat dissipation performance.

[0062] According to the present invention, the cooling plate reduces the temperature of the discharged dust to below the complexation temperature, thereby preventing the dust from complexing outside the battery package.

[0063] The above-mentioned effects and specific effects of the present invention will be described in conjunction with the following description of the preferred embodiments of the present invention. [Brief explanation of the drawings]

[0064] [Figure 1] 1 is a perspective view showing a schematic internal structure of a battery package according to the present invention; [Figure 2] 2 is a perspective view schematically illustrating an internal filter portion and a vent device in the battery package of FIG. 1. FIG. [Figure 3] FIG. 3 is an exploded perspective view schematically illustrating the vent device of FIG. 2. [Figure 4]3 is a perspective view schematically illustrating a state in which vent gas in the vent device of FIG. 2 is diverted in the flow direction. [Figure 5] 3 is a perspective view schematically illustrating a state in which vent gas in the vent device of FIG. 2 is discharged to the outside. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0065] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0066] The present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms and may be modified in various ways. However, these embodiments are provided to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. Therefore, the present invention is not limited to the embodiments disclosed below, and should be understood to include any modifications, equivalents, or alternatives within the technical spirit and scope of the present invention, as well as the substitution or addition of the configuration of any embodiment with the configuration of another embodiment.

[0067] The accompanying drawings are intended to facilitate understanding of the embodiments disclosed in this specification, and should not be construed as limiting the technical ideas disclosed in this specification, but should be understood to include any modifications, equivalents, or alternatives that fall within the spirit and technical scope of the present invention. The components in the drawings may be exaggerated in size or thickness for ease of understanding, but this should not be interpreted as limiting the scope of protection of the present invention.

[0068] The terms used in this specification are merely used to describe particular embodiments or examples and are not intended to limit the present invention. Furthermore, singular terms include plural terms unless the context clearly dictates otherwise. Terms such as "comprises," "consists," and the like in the specification are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. In other words, terms such as "comprises," "consists," and the like in the specification should not be understood to preclude the presence or possibility of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0069] Although terms including ordinal numbers, such as first, second, etc., are used to describe various components, the components are not limited by the terms and are used only to distinguish one component from another.

[0070] When a component is referred to as being "coupled" or "connected" to another component, it should be understood that the component may be directly coupled or connected to the other component, but that there may be other components between them. On the other hand, when a component is referred to as being "directly coupled" or "directly connected" to another component, it should be understood that there are no other components between them.

[0071] When a component is referred to as being "on top of" or "under" another component, it should be understood that it is not only positioned directly on top of the other component, but that there may be other components in between.

[0072] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms similar to those defined in commonly used dictionaries should be interpreted to have a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

[0073] In the following, a battery package according to an embodiment of the present invention will be described.

[0074] FIG. 1 is a perspective view schematically showing the internal structure of a battery package according to the present invention, FIG. 2 is a perspective view schematically showing an internal filter section and a vent device in the battery package of FIG. 1, FIG. 3 is an exploded perspective view schematically showing the vent device of FIG. 2, FIG. 4 is a perspective view schematically showing a state in which vent gas in the vent device of FIG. 2 detours around the flow direction, and FIG. 5 is a perspective view schematically showing a state in which vent gas in the vent device of FIG. 2 is discharged to the outside.

[0075] 1 to 5, a battery package 1 according to an embodiment of the present invention includes a battery module 20, an internal filter unit 30, and a vent device 100.

[0076] The battery package 1 includes a case 10. The case 10 may be made of a thermally conductive material so as to dissipate internal thermal energy to the outside. In one example, the case 10 may be formed in the shape of a rectangular parallelepiped as a whole. However, the shape of the case 10 is not limited thereto.

[0077] At least one battery module 20 is installed inside the case 10. The battery modules 20 are housed in respective spaces in the case 10. A plurality of battery cells (not shown) are stacked inside the battery module 20. In this case, the battery cells may be any of pouch-type battery cells, cylindrical battery cells, and prismatic battery cells. These battery modules 20 can be manufactured in various sizes and shapes.

[0078] At least one vent device 100 is installed in the case 10. Gas and dust generated when the battery module 20 ignites moves from the internal space of the case 10 in which the battery module 20 is installed toward the vent device 100. Although not shown, the battery package 1 may further include a structure for guiding the discharge of gas and dust generated in the battery module 20 due to thermal runaway.

[0079] The internal filter unit 30 is installed on a gas and dust exhaust path leading from a space in which the battery module 20 is installed to the vent device 100. The internal filter unit 30 is arranged to block the exhaust path of gas and dust generated in the battery module 20. For example, in FIG. 1, the internal filter unit 30 is arranged to block the outside of the battery module 20. The internal filter unit 30 may be installed in a form that blocks all flow cross sections of the gas and dust exhaust path so that the gas and dust cannot bypass.

[0080] At least one internal filter unit 30 is installed along the gas and dust exhaust path to perform primary filtration of vent gas generated when the battery module 20 is ignited. When two or more internal filter units 30 are installed on the gas and dust exhaust path, they may be installed spaced apart from each other along the path.

[0081] When there are different exhaust paths, the internal filter unit 30 may be installed for each exhaust path. In the embodiment shown in Fig. 1, exhaust paths for gas and dust are provided on both sides in the width direction of the battery module 20. Therefore, in this embodiment, a pair of internal filter units 30 is installed inside the case 10 so as to separate both sides in the width direction of the battery module 20.

[0082] The internal filter unit 30 filters relatively large particles of flammable dust contained in the vent gas. The internal filter unit 30 may include a prefilter that allows the vent gas to pass quickly while performing primary filtering of particles larger than a first size. The internal filter unit 30 includes a filter frame 31 having a plurality of communication holes formed therein and prefilters 33 fixed to both side surfaces of the filter frame 31. The filter frame 31 defines both sides in the width direction of the battery module 20. The filter frame 31 also supports the prefilter 33 to prevent it from being deformed or damaged by the vent gas generated when the battery module 20 ignites. The prefilter 33 filters the flammable dust passing through the plurality of communication holes.

[0083] The vent device 100 blocks and bypasses the vent gas filtered by the internal filter unit 30 of particles larger than a first size, and secondarily filters out flammable dust particles of a second size or larger from the vent gas filtered by the internal filter unit 30. The second size is smaller than the first size. The vent device 100 filters out flammable dust particles of a certain size contained in the vent gas so that they are not discharged. When flammable dust particles of a certain size or larger are discharged through the vent device 100, they may come into contact with external air and act as an ignition point. However, in the present invention, the vent device 100 secondarily filters out flammable dust particles of a certain size contained in the vent gas, thereby preventing ignition even if small dust particles contained in the vent gas are discharged to the outside.

[0084] The vent device 100 includes a screen portion 110, a cooling plate 120, and a vent filter portion 130.

[0085] The screen unit 110 is disposed on the discharge path of the vent gas, spaced apart from the internal filter unit 30. The screen unit 110 is also disposed with a slight gap between it and the vent filter unit 130. The screen unit 110 is disposed to face the vent filter unit 130. The area of ​​the screen unit 110 may be the same as or slightly larger than the area of ​​the vent filter unit 130.

[0086] Without the screen unit 110, the vent gas passing through the inner filter unit 30 would flow quickly in a straight line toward the vent filter unit 130 and reach the vent filter unit 130. However, with the screen unit 110 installed as described above, the vent gas flowing toward the vent filter unit 130 collides with the screen unit 110, significantly slowing down its flow rate. When the flow rate of the vent gas slows down, the heavier dust particles in the vent gas fall downward due to gravity.

[0087] The screen unit 110 blocks the vent gas that flows quickly and over the shortest distance from the internal filter unit 30 toward the vent filter unit 130, thereby changing the direction of travel of the vent gas. The screen unit 110 is disposed opposite the cooling plate 120. The screen unit 110 is disposed spaced apart from the cooling plate 120, forming a detour space 118 through which the vent gas that has changed direction flows. The velocity vector of the vent gas that flows detoured through the detour space 118 is significantly deviated from the direction normal to the surface of the cooling plate 120.

[0088] The cooling plate 120 includes a passage hole 122 through which the vent gas passes, and the heat of the vent gas is transferred to the cooling plate 120 to quickly dissipate the heat. The cooling plate 120 is installed in surface contact with the case 10 made of a thermally conductive material. As the vent gas passes through the passage hole 122, the temperature of the vent gas is reduced by thermal contact with the cooling plate 120.

[0089] Meanwhile, tests have shown that the dust generated when a lithium-ion battery or lithium polymer battery catches fire becomes complexed at temperatures above 400°C. However, according to the present invention, the cooling plate 120 reduces the temperature of the discharged dust to about 350-380°C, thereby cooling the dust below the complexation temperature and preventing the dust from becoming complexed.

[0090] The vent filter unit 130 is installed in the through hole portion 122 of the cooling plate 120 so as to filter the vent gas redirected by the screen unit 110. The through hole portion 122 includes a plurality of through holes. The through hole portion 122 may be formed in a square or circular shape in the center of the screen panel 111. The filter surface of the vent filter unit 130 is arranged so as to block the through hole portion 120.

[0091] According to the embodiment, since the vent gas reaches the vent filter unit 130 after being redirected by the screen unit 110, it is possible to significantly reduce the pressure of the vent gas acting on the vent filter unit 130. In addition, by significantly reducing the pressure of the vent gas, it is possible to prevent the mesh of the vent filter unit 130 from expanding due to the pressure of the vent gas. This makes it possible to prevent dust particles larger than the mesh of the vent filter unit 130 from passing through the vent filter unit 130.

[0092] In addition, the mesh of the vent filter unit 130 is formed to a size that can filter dust particles of about 1 mm or larger. Generally, when dust particles have a particle size of about 1 mm or larger, they are likely to be complexed. In contrast, the vent filter unit 130 of the present invention filters dust particles of 1 mm or larger that can be complexed, thereby preventing the dust particles from being complexed outside the battery package 1.

[0093] The internal filter units 30 may be disposed on both sides in the width direction of the battery module 20. The internal filter units 30 may be formed in the shape of a rectangular plate so as to partition the space between the vent device 100 and the case 10.

[0094] The vent devices 100 may be coupled to both sides of the case 10 so as to face the internal filter units 30. At least two vent devices 100 may be installed on each side so as to face the internal filter units 30. This allows gas and dust generated when the battery module 20 catches fire to be discharged to both sides of the case 10.

[0095] The screen unit 110 includes a screen panel 111 and a frame unit 113 .

[0096] The screen panel 111 is installed between the internal filter unit 30 and the cooling plate 120 so as to block the vent gas. The screen panel 111 may be formed in a rectangular shape. The screen panel 111 is disposed so as to face the passage hole portions 122 of the cooling plate 120. The screen panel 111 is disposed away from the gas inlet side of the passage hole portions 122, but is formed larger than the passage hole portions 122 so as to block the gas inlet side of the passage hole portions 122.

[0097] The frame part 113 connects the screen panel 111 and the cooling plate 120 to form a bypass space part 118 between the screen panel 111 and the cooling plate 120. The frame part 113 separates the screen panel 111 from the cooling plate 120 by a predetermined distance.

[0098] As the vent gas that has been primarily filtered by the internal filter unit 30 collides with the screen panel 111, relatively large dust particles fall to the underside of the screen panel 111. This prevents dust particles that have bypassed the screen panel 111 and reached the vent filter unit 130 from clogging the mesh of the vent filter unit 130, thereby preventing an increase in the internal pressure of the vent gas.

[0099] In addition, the pressure of the vent gas decreases as it collides with and bypasses the peripheral portion of the screen panel 111, and then further decreases as it flows into the bypass space between the screen panel 111 and the cooling plate 120. At this time, the pressure of the vent gas decreases before it passes through the vent filter unit 130, preventing the vent filter unit 130 from being damaged or deformed by the flow pressure of the vent gas. In addition, because the pressure applied to the vent filter unit 130 decreases, dust particles larger than the mesh of the vent filter unit 130 are prevented from passing through the vent filter unit 130. As a result, dust particles of a size that can be complexed are filtered by the vent filter unit 130, preventing the occurrence of a fire outside the battery package 1.

[0100] The frame portion 113 includes a front frame 114 , a plurality of connecting frames 115 , and a rear frame 116 .

[0101] The front frame 114 is connected to the screen panel 111. The front frame 114 may be formed in a square or circular shape. The front frame 114 may be welded to the screen panel 111 or may be fixed by a separate fastening member.

[0102] The multiple connecting frames 115 extend toward the cooling plate 120 side of the front frame 114, and form a detour space 118 between the front frame 114 and the screen panel 111. The multiple connecting frames 115 are arranged perpendicular to the screen panel 111. The multiple connecting frames 115 may be formed integrally with the front frame 114. Alternatively, the multiple connecting frames 115 may be connected to the front frame 114 by welding or with fastening members.

[0103] The rear frame 116 is connected to a plurality of connecting frames 115, faces the front frame 114, and is installed on the cooling plate 120. The rear frame 116 may be fixed to the cooling plate 120 by welding or a fastening member. The rear frame 116 may be formed in a square or circular shape.

[0104] The front frame 114 and the rear frame 116 may be formed larger than the passage hole portion 122. This allows the vent gas to detour after colliding with the screen panel 111 and then flow into the passage hole portion 122. This also increases the number of detour paths for the vent gas.

[0105] The frame part 113 is entirely made of a thermally conductive material, so that thermal energy of the frame part 113 can be transferred to the cooling plate 120. As a result, the heat dissipation performance of the battery package 1 can be improved.

[0106] The cooling plate 120 may include a cooling body portion 121 and a heat conduction promoting portion 124 .

[0107] The cooling body 121 has a through hole 122. The cooling body 121 is generally formed in a rectangular plate shape. The cooling body 121 may be made of a metal material such as aluminum or stainless steel, which has excellent thermal conductivity. The cooling body 121 may have the same or approximately the same thickness as the case 10 so as to be able to exchange heat with the vent gas.

[0108] The heat conduction facilitating portion 124 is formed on the periphery of the cooling body portion 121 with a thickness thinner than that of the cooling body portion 121. The heat conduction facilitating portion 124 may be formed to have a step with the cooling body portion 121. In this case, installation holes (not shown) are formed on both sides of the case 10 so that the cooling plate 120 can be installed. Stepped heat dissipation steps 11 are formed on both sides of the installation holes. When the cooling body portion 121 is installed in the installation holes, the heat conduction facilitating portion 124 and the heat dissipation steps 11 come into surface contact. In addition, the side portions 123 arranged on both sides of the cooling body portion 121 come into surface contact with the heat dissipation steps 11. This increases the thermal contact area between the cooling body portion 121 and the case 10, and thermal energy of the vent gas is conducted to the case 10 via the cooling body portion 121, thereby improving heat dissipation performance.

[0109] The through-holes 122 of the cooling plate 120 may be formed in a lattice pattern. Lattice-shaped ribs that cross the through-holes 122 can stably support the vent filter unit 130 installed in the through-holes 122. This can prevent the vent filter unit 130 from being deformed or damaged by gas pressure.

[0110] The vent filter section 130 includes a first vent filter 131 and a second vent filter 132 .

[0111] The first vent filter 131 is disposed inside the passage hole portion 122, and the second vent filter 132 is disposed outside the passage hole portion 122. The first vent filter 131 and the second vent filter 132 have a size that can cover the entire passage hole portion 122. In this case, the mesh of the second vent filter 132 may be formed to be slightly smaller than or the same size as the mesh of the first vent filter 131. This allows the vent gas to be first filtered by the first vent filter 131 and then further filtered by the second vent filter 132. In addition, the second vent filter 132 can filter dust particles that are relatively smaller than those of the first vent filter 131 or dust particles of the same size.

[0112] When the passing hole portion 122 is formed in a rectangular shape, the first vent filter 131 and the second vent filter 132 may also be formed in a rectangular shape. The first vent filter 131 and the second vent filter 132 may be changed into various shapes depending on the shape of the passing hole portion 122.

[0113] Although the present invention has been described above with reference to illustrative drawings, it is clear that the present invention is not limited to the embodiments and drawings disclosed in this specification, and that various modifications can be made by those skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configurations of the present invention are not explicitly described in the above-described embodiments of the present invention, it is natural that the effects that can be predicted by the configurations should also be recognized. [Explanation of symbols]

[0114] 1 Battery Package 10 cases 11 Heat radiation step part 20 Battery Module 30 Internal filter section 31 Filter Frame 33 Pre-filter 100 Vent Device 110 Screen section 111 Screen Panel 113 Frame section 114 Front Frame 115 Connecting Frame 116 Rear frame 118 Detour space 120 Cooling Plate 121 Cooling body part 122 Passing hole 123 Side part 124 Heat conduction promotion section 130 Vent filter section 131 First Vent Filter 132 Second Vent Filter

Claims

1. A vent device installed in a battery pack to filter vent gas of the battery pack, comprising: a cooling plate having a passage hole formed therein to allow the vent gas to pass therethrough and to dissipate heat of the vent gas; a screen portion disposed apart from the passage hole portion in a direction opposite to the direction in which the vent gas passes through the passage hole portion and blocking the passage hole portion in the passing direction; a vent filter portion installed in the passage hole portion of the cooling plate and filtering the vent gas passing through the passage hole portion; 1. A vent device, comprising:

2. The screen portion is a screen panel that blocks the passage hole; a frame portion that connects the screen panel and the cooling plate to form a bypass space between the screen panel and the cooling plate; The vent device of claim 1 , comprising:

3. The vent device according to claim 2 , wherein the screen panel is disposed so as to face the passage hole portion of the cooling plate.

4. The vent device according to claim 2 , wherein the edge of the screen panel and the cooling plate are spaced apart in the passing direction.

5. The frame portion is a front frame on which the screen panel is mounted; a plurality of connecting frames extending from the front frame toward the cooling plate to form a bypass space between the cooling plate and the screen panel; a rear frame connected to the plurality of connecting frames, facing the front frame, and installed on the cooling plate; The vent device of claim 2 , comprising:

6. The cooling plate is a cooling body portion in which the passage hole portion is formed; a heat conduction promoting portion formed on the periphery of the cooling body portion and thinner than the cooling body portion; The vent device of claim 1 , comprising:

7. The vent device according to claim 1 , wherein the through-holes of the cooling plate are formed in a lattice pattern.

8. The vent filter portion is a first vent filter disposed inside the passage hole in the passing direction; a second vent filter disposed outside the passage hole in the passage direction; 7. The vent device of claim 6, comprising:

9. The vent device according to claim 1 , wherein the screen portion, the vent filter portion, and the cooling plate are aligned along the passage direction.

10. one or more battery modules disposed within the case; at least one or more internal filter units arranged to close the outside of the battery module and performing primary filtration of vent gas generated when the battery module is ignited; a vent device having at least one mesh installed in the case, which intercepts and diverts the vent gas filtered by the internal filter unit and performs secondary filtration of dust of an ignitable size from the vent gas filtered by the internal filter unit; Including the battery package.

11. The vent device comprises: a screen portion facing the internal filter portion and blocking the vent gas to change the direction of travel of the vent gas; a cooling plate having a passage hole formed therein to allow the vent gas to pass therethrough and to dissipate heat of the vent gas; a vent filter unit installed in the passage hole of the cooling plate so as to filter the vent gas redirected by the screen unit; 11. The battery package of claim 10, comprising:

12. the internal filter units are disposed on both sides of the battery module in a width direction, The battery package of claim 11 , wherein the vent devices are coupled to both sides of the case so as to face the internal filter portion.

13. The battery package according to claim 12 , wherein at least two of the vent devices are installed on each side of the case.

14. The screen portion is a screen panel installed between the internal filter unit and the cooling plate so as to block the vent gas; a frame portion that connects the screen panel and the cooling plate to form a bypass space between the screen panel and the cooling plate; 12. The battery package of claim 11, comprising:

15. The battery package according to claim 14 , wherein the screen panel is disposed so as to face the passage hole of the cooling plate.

16. The battery package according to claim 14 , wherein the screen panel diverts the vent gas toward a periphery of the frame portion.

17. The frame portion is a front frame on which the screen panel is mounted; a plurality of connecting frames extending toward the cooling plate side of the front frame to form a bypass space between the front frame and the screen panel; a rear frame connected to the plurality of connecting frames, facing the front frame, and installed on the cooling plate; 15. The battery package of claim 14, comprising:

18. The cooling plate is a cooling body portion in which the passage hole portion is formed; a heat conduction promoting portion formed around the periphery of the cooling body portion and thinner than the cooling body portion, and coupled to the case in surface contact; 12. The battery package of claim 11, comprising:

19. The battery package according to claim 18 , wherein the through-holes of the cooling plate are formed in a lattice pattern.

20. The vent filter portion is a first vent filter disposed inside the passage hole; a second vent filter disposed outside the passage hole; 12. The battery package of claim 11, comprising:

21. The battery package according to claim 11 , wherein the screen portion, the vent filter portion, and the cooling plate are arranged in a straight line.

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