Gas venting device, battery module and battery pack including same

Abstract

The present invention relates to a gas venting device and a battery module and a battery pack including the same, and by decreasing or increasing the cross-sectional area of ​​the flow path according to the gas exhaust direction, a larger flow rate of gas can be exhausted even if a venting disk of the same area is used. Also, by installing the venting disk on the outlet side of the gas exhaust flow path, it is possible to achieve effects such as protecting internal parts.

Description

[Technical Field]

[0001] The present invention relates to a gas venting device for discharging gas from inside a battery module or a battery pack.

[0002] The present invention also relates to a battery module and a battery pack including the gas venting device.

[0003] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0072868, filed on June 15, 2022, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference. [Background technology]

[0004] A battery pack used in an electric vehicle has a structure in which a number of battery modules, each including a plurality of secondary batteries, are connected in series or parallel to obtain high output. The secondary battery includes positive and negative electrode current collectors, a separator, an active material, an electrolyte, etc., and can be repeatedly charged and discharged through electrochemical reactions between the components.

[0005] A secondary battery may generate gas from inside at any time during use as it is repeatedly charged and discharged. This gas is called venting gas. For example, when an overcurrent flows, the temperature inside the secondary battery rises rapidly. This rapid temperature rise causes a decomposition reaction of the electrolyte, which can generate gas. When gas is generated inside a secondary battery in a battery pack, the gas may be trapped inside the pack, causing the battery pack to explode, or it may flow into the interior of a vehicle or the like through the battery pack's cooling duct. For this reason, battery packs are equipped with a venting device that releases internal gas to the outside and reduces internal pressure.

[0006] A venting device generally has a structure in which a venting disk that can burst depending on the internal pressure is inserted between an inlet through which gas flows in and an outlet through which the gas is discharged from a battery module or a battery pack.

[0007] FIG. 1 is a perspective view showing an example of a conventional gas venting device, and FIG. 2 is a schematic diagram showing the gas flow state at the outlet of the conventional gas venting device.

[0008] As shown in the figure, the conventional gas venting device 1 has an advantage in that the gas exhaust passage 11 of the bracket 10 communicating with the venting disk 20 is simply designed in a cylindrical shape, making the device easy to design.

[0009] However, since the conventional gas venting device 1 simply has a cylindrical structure in which the gas inlet 12 and outlet 13 are connected, the pressure between the inlet and outlet is not large, and there is a limit to the amount of gas that can be discharged.

[0010] Furthermore, when a large amount of gas is generated, a phenomenon known as choking, in which the flow stagnates at the outlet of the gas exhaust passage 11, can occur, resulting in increased flow instability. To avoid this choking phenomenon, the venting disk must be designed to burst at a low pressure. However, considering the burst pressure tolerance, this can make it difficult to ensure the reliability of the venting disk components.

[0011] Furthermore, as shown in FIG. 2, in a gas venting device with a cylindrical flow path 11, unstable flow at the outlet and sudden pressure changes at the outlet can cause strong shock waves near the outlet, posing a safety risk.

[0012] Furthermore, there is a problem that the pressure at the outlet increases again due to the local pressure increase downstream of the shock wave, which may result in a decrease in the pressure difference between the inlet and outlet, and a decrease in the discharge flow rate. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] Korean Patent Publication No. 10-2018-0039986 Summary of the Invention [Problem to be solved by the invention]

[0014] The present invention has been made to solve the above problems, and an object of the present invention is to provide a gas venting device that can discharge a greater flow rate per unit time even with a venting disk of the same area, and a battery module and battery pack including the same.

[0015] Another object of the present invention is to provide a gas venting device that can eliminate the choking phenomenon at the outlet and increase the burst pressure of the venting disc.

[0016] The present invention also provides a gas venting device that prevents shock waves from occurring at the outlet of the flow path, thereby increasing safety and further improving flow stability.

[0017] Furthermore, the present invention provides a gas venting device that, by installing a venting disc at the outlet side of the flow path, prevents contamination of the flow path due to the inclusion of disc fragments when the venting disc bursts, and maximizes the flow of gas within the flow path, enabling stable discharge of exhaust gas. [Means for solving the problem]

[0018] To solve the above problems, the present invention provides a gas venting device that includes a hollow bracket member having a gas exhaust passageway, and a venting disk that is connected to the bracket member to block the gas exhaust passageway and is configured to burst when a predetermined pressure is applied, wherein the gas exhaust passageway includes a first passageway whose cross-sectional area decreases continuously or sequentially along the gas exhaust direction, and a second passageway that is formed continuous with the first passageway and whose cross-sectional area increases continuously or sequentially along the gas exhaust direction, and wherein the venting disk is installed on the outlet side of the gas exhaust passageway.

[0019] The first and second flow paths may be the same or different in length.

[0020] As a specific example, the cross-sectional profiles of both sides of the first flow path may be tapered to approach each other in the gas discharge direction, and the cross-sectional profiles of both sides of the second flow path may be tapered to move away from each other in the gas discharge direction.

[0021] The taper slope of the first flow path and the taper slope of the second flow path can be the same or different.

[0022] The cross-sectional profiles of both sides of the first flow path and the second flow path may be formed in a linear or curved tapered shape.

[0023] In this case, the first flow path may have a first truncated cone shape with cross-sectional profiles on both sides formed in a linear or curved tapered shape, and the second flow path may have a second truncated cone shape with cross-sectional profiles on both sides formed in a linear or curved tapered shape.

[0024] As another example, the first flow path may have a first truncated pyramid shape with tapered cross-sectional profiles on both sides, and the second flow path may have a second truncated pyramid shape with tapered cross-sectional profiles on both sides.

[0025] In this case, the first truncated pyramid and the second truncated pyramid may have a trapezoidal cross-sectional profile in the shape of a quadrangular truncated pyramid.

[0026] Furthermore, a flow channel having linear cross-sectional profiles at both sides can be connected to the inlet side of the first flow channel.

[0027] As one example, the bracket member may have a through hole, the gas venting device may be inserted into the through hole and include an exhaust guide through which the gas exhaust passage is formed, and the venting disk may be coupled to the bracket member and the exhaust guide on the outlet side of the gas exhaust passage of the exhaust guide to block the gas exhaust passage.

[0028] A fastening portion for fastening the discharge guide to the bracket member may be formed on an outer circumferential surface of the discharge guide.

[0029] The bracket member and the discharge guide may be coupled together by a screw fastening method.

[0030] Meanwhile, the venting disk includes an outer disk portion connected to the bracket member, and an inner disk portion integrally formed with the outer disk portion, blocking the gas exhaust flow path and rupturing when a predetermined pressure is applied, and a notch may be formed in the inner disk portion so that the inner disk portion ruptures when the predetermined pressure is applied.

[0031] The present invention also provides a battery module including the gas venting device.

[0032] The battery module may include a plurality of secondary batteries and a module frame on which the secondary batteries are mounted, and the gas venting device may be coupled to one side of the module frame.

[0033] The present invention also provides a battery pack including the gas venting device.

[0034] The battery pack includes at least one battery module including a plurality of secondary batteries, and a battery pack case in which the battery module is mounted, and the gas venting device as described above may be coupled to one side of the battery pack case. [Effects of the Invention]

[0035] The gas venting device and the battery module or battery pack including the same according to the present invention can improve the safety of the battery module and battery pack by discharging a larger flow rate per unit time even when using a venting disk of the same area.

[0036] In addition, the unique gas exhaust flow path shape eliminates choking even when a large amount of venting gas is generated, ensuring a relatively stable gas flow at the outlet. Furthermore, since the pressure difference between the inlet and outlet can be increased while avoiding choking, the burst pressure of the venting disk can be set relatively high.

[0037] In addition, the discharged gas is discharged at a high velocity, and the inertia of such a high velocity flow can generate shock waves far from the outlet or can prevent shock waves from being generated at all.

[0038] Furthermore, by installing the venting disc on the outlet side of the flow path, the present invention prevents contamination of the flow path due to the inclusion of disc fragments in the event of the venting disc rupture, and maximizes the flow of gas within the flow path, enabling the stable discharge of exhaust gas.

[0039] Therefore, the gas venting device of the present invention, and the battery module and battery pack including the same, have the advantage of being able to significantly improve safety even in the event of an event such as heat propagation. [Brief explanation of the drawings]

[0040] [Figure 1]FIG. 1 is a perspective view showing an example of a conventional gas venting device. [Figure 2] 1 is a schematic diagram showing the gas flow state at the outlet of a conventional gas venting device. [Figure 3] 1 is a diagram showing an embodiment of a gas venting device of the present invention. [Figure 4] 1 is a schematic diagram showing the gas flow state at the outlet of the gas venting device of the present invention. FIG. [Figure 5] 1 is a view showing a flow path shape of a gas venting device according to an embodiment of the present invention; [Figure 6] 10 is a view showing a flow path shape of a gas venting device according to another embodiment of the present invention. [Figure 7] 10 is a view showing a flow path shape of a gas venting device according to another embodiment of the present invention. [Figure 8] 1 is a view showing a gas venting device according to another embodiment of the present invention; [Figure 9] 1 is a view showing a fastening structure of a gas venting device according to the present invention; [Figure 10] FIG. 10 is a perspective view of the gas venting device of FIG. 9. [Figure 11] 1 is a schematic diagram showing the shape of a venting disk according to the present invention. FIG. [Figure 12] 1 is a schematic diagram showing a coupling structure of a gas venting device in a battery module according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0041] The gas venting device of the present invention includes a hollow bracket member having a gas exhaust passage, and a venting disk connected to the bracket member to block the gas exhaust passage and configured to rupture when a predetermined pressure is applied, wherein the gas exhaust passage includes a first passage whose cross-sectional area decreases continuously or sequentially along the gas exhaust direction, and a second passage formed continuous with the first passage and whose cross-sectional area increases continuously or sequentially along the gas exhaust direction, and wherein the venting disk is installed on the outlet side of the gas exhaust passage.

[0042] The present invention also provides a battery module including the gas venting device.

[0043] The battery module may include a plurality of secondary batteries and a module frame on which the secondary batteries are mounted, and the gas venting device may be coupled to one side of the module frame.

[0044] The present invention also provides a battery pack including the gas venting device.

[0045] The battery pack includes at least one battery module including a plurality of secondary batteries, and a battery pack case in which the battery module is mounted, and the gas venting device as described above may be coupled to one side of the battery pack case.

[0046] The present invention will be described in detail below. Before that, the terms and words used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concepts of the terms in order to best describe his own invention.

[0047] In this application, terms such as "comprise" and "have" are intended to specify the presence of a feature, numeral, step, operation, component, part, or combination thereof described in the specification, but should be understood as not precluding the presence or addition of one or more other features, numerals, steps, operations, components, parts, or combinations thereof. Furthermore, when a layer, film, region, plate, or other part is described as being "on" another part, this includes not only the case where it is "directly on" the other part, but also the case where there is another part between them. Conversely, when a layer, film, region, plate, or other part is described as being "under" another part, this includes not only the case where it is "directly under" the other part, but also the case where there is another part between them. Furthermore, in this application, "over" can include not only the case where it is "on top" but also the case where it is "under" the other part.

[0048] The present invention will be described in detail below.

[0049] Fig. 3 is a diagram showing one embodiment of the gas venting device of the present invention, and Fig. 4 is a schematic diagram showing the gas flow state at the outlet of the gas venting device of the present invention. Fig. 3(a) is a schematic cross-sectional view of the gas venting device, and Fig. 3(b) is a schematic perspective view of the gas venting device.

[0050] The gas venting device 100 according to the present invention includes a hollow bracket member 110 having a gas exhaust passage 111, and a venting disk 120 connected to the bracket member 110 to block the gas exhaust passage 111 and configured to burst when a predetermined pressure is applied, the gas exhaust passage 111 including a first passage 111A whose cross-sectional area decreases continuously or sequentially along the gas exhaust direction, and a second passage 111B formed continuous with the first passage and whose cross-sectional area increases continuously or sequentially along the gas exhaust direction, and the venting disk 120 is installed on the outlet 113 side of the gas exhaust passage 111.

[0051] Referring to FIG. 3, a gas venting device 100 according to the present invention includes a hollow bracket member 110 having a gas exhaust passage 111 , and a venting disk 120 coupled to the bracket member 110 .

[0052] The bracket member 110 is formed to be hollow, and this hollow (through-hole) space can directly form the gas exhaust flow path 111. Alternatively, as will be described later, another member (e.g., an exhaust guide) having a gas exhaust flow path can be positioned in this hollow space. In the embodiment of FIG. 3, the bracket member 110 has a through-hole in the approximate center, and the through-hole forms the gas exhaust flow path 111.

[0053] The bracket member 110 is provided with a venting disk 120 that blocks the gas exhaust flow path 111. The venting disk 120 is made of a rupturable material that ruptures when a predetermined pressure is applied. For example, it may be made of a rupturable metal or plastic material. It may also be made of a polymer material that can be thinned, such as vinyl or film. Meanwhile, a notch may be formed in the portion of the venting disk 120 corresponding to the flow path to facilitate rupture.

[0054] The predetermined pressure may be determined taking into consideration the design of the cells in the battery module or battery pack and the required level of safety. For example, the venting disk 120 may be designed to burst when a fire occurs in the module or pack or when a predetermined high temperature and pressure are exceeded. Alternatively, to enhance safety, the venting disk 120 may be designed to burst at a relatively low set pressure, which is the pressure before an internal explosion occurs.

[0055] The venting disk 120 is positioned on the gas exhaust passage 111 and is coupled to the bracket member 110 so as to block the gas exhaust passage 111 .

[0056] The gas discharge passage 111 includes a first passage 111A whose cross-sectional area decreases continuously or gradually along the gas discharge direction, and a second passage 111B formed continuously with the first passage and whose cross-sectional area increases continuously or gradually along the gas discharge direction. As described below, by forming two passages with different cross-sectional areas continuously, the present invention can eliminate the choking phenomenon, increase the outlet flow velocity, discharge a large amount of gas, and prevent the generation of shock waves, thereby improving flow stability.

[0057] Generally, a battery pack is equipped with multiple battery modules, each of which contains multiple secondary batteries. These secondary batteries generate gas due to the decomposition reaction of the electrolyte during repeated charging and discharging. Heat generated during the battery charging and discharging process promotes the generation of gas, causing the gas to expand and increasing the pressure inside the battery module or battery pack. If this process continues, the battery module or battery pack may explode, or the internal gas may enter the interior of a vehicle through a duct or the like. Therefore, a venting device is installed that releases gas by bursting a venting disc 120 when the gas pressure exceeds a predetermined level.

[0058] As described above, conventional venting devices simply have a cylindrical gas exhaust flow path in which a gas inlet and outlet are connected, and therefore the pressure difference between the inlet and outlet is not large, limiting the amount of gas that can be exhausted.

[0059] In contrast, the gas discharge flow path 111 of the present invention comprises a first flow path 111A in which the flow path cross-sectional area decreases continuously or sequentially along the gas discharge direction, and a second flow path 111B formed continuous with the first flow path and in which the flow path cross-sectional area increases continuously or sequentially along the gas discharge direction.

[0060] When the cross-sectional area of ​​the gas exhaust flow path 111 decreases, as in the case of the first flow path 111A, the internal pressure increases as the gas velocity decreases at the inlet 112 of the first flow path 111A, which has a large cross-sectional area, and the internal pressure decreases as the gas velocity increases at the outlet of the first flow path 111A, which has a small cross-sectional area. As a result, the pressure difference between the inlet and outlet of the first flow path 111A increases locally, allowing a larger flow rate of gas to be exhausted even when using a venting disk 120 with the same area. Therefore, when the internal pressure due to gas generated inside the battery module or battery pack exceeds a reference value, the gas can be quickly exhausted, thereby improving the safety of the battery module and battery pack. That is, the first flow path 111A, which has a decreasing cross-sectional area, of the present invention can increase the pressure difference between the inlet and outlet compared to conventional cylindrical flow paths, thereby increasing the gas exhaust flow rate.

[0061] Meanwhile, the so-called choking phenomenon can occur not only in conventional cylindrical flow paths but also in flow paths with a decreasing cross-sectional area, such as the first flow path 111A. As described above, a larger pressure difference between the inlet and outlet of a flow path is advantageous for discharging a large amount of gas. However, no matter how large the pressure difference between the inlet and outlet is designed to be, the maximum gas flow velocity that can be reached at the outlet of a flow path with a decreasing cross-sectional area, such as the first flow path 111A, is limited to the sonic speed (M=1). That is, in the subsonic region where the gas flow velocity is below the speed of sound, the gas is considered to be a so-called incompressible gas, and the gas flow velocity increases as the cross-sectional area of ​​the gas discharge flow path decreases. However, in the case of such subsonic flow, no matter how large the pressure difference is, according to the laws of physics, the gas flow velocity at the outlet of the flow path cannot exceed the sonic speed.

[0062] Therefore, even if the pressure difference between the inlet and outlet continues to increase, once the outlet flow velocity reaches the sonic velocity, the flow velocity and flow of the gas at the outlet stagnates, resulting in a so-called choking phenomenon.

[0063] In the present invention, in order to eliminate this choking phenomenon and further increase the outlet flow rate, a second flow path 111B having an increased flow path cross-sectional area is provided continuous with the first flow path 111A.

[0064] After the outlet flow velocity of first flow path 111A reaches the sonic speed, if the flow path cross-sectional area increases again as in second flow path 111B, the gas behaves as a so-called compressible gas and, unlike the first flow path, exhibits supersonic flow, where the flow velocity increases with the flow path cross-sectional area. That is, the flow velocity of the gas that was stagnant at the outlet of first flow path 111A further increases as the cross-sectional area increases in second flow path 111B, resulting in a flow exceeding the sonic speed. Therefore, according to the present invention, choking is eliminated by successively forming first flow path 111A with a decreasing cross-sectional area and second flow path 111B with an increasing cross-sectional area, and finally, the gas flow velocity at outlet 113 of the gas discharge flow path, i.e., the outlet of second flow path 111B, is further increased, making it possible to discharge a large amount of gas.

[0065] The present invention also has the advantage of being able to reduce or eliminate the generation of shock waves as in the prior art.

[0066] Referring to Figure 2, conventional gas exhaust flow paths do not have a high gas flow rate at the outlet, which causes shock waves to form near the outlet. Shock waves are an irreversible loss of flow energy and are accompanied by a sudden increase in pressure behind the outlet. As a result, the pressure difference between the inlet and outlet decreases, hindering gas exhaust.

[0067] On the other hand, in the case of the present invention, which has flow paths with decreasing and increasing cross-sectional areas as shown in Figure 4, the outlet flow velocity is very high, almost reaching supersonic speeds, and shock waves are generated far from the outlet due to the inertia of such high-speed flow. Given the recent rise in the risk of battery fires or explosions, it is important to design flow paths so that such shock waves can be avoided within the flow area of ​​concern. By providing first and second flow paths 111A and 111B with different cross-sectional areas, the present invention can generate shock waves far from the outlet 113. Furthermore, because the gas flow energy is lost during this process, the intensity of the generated shock wave is much smaller, as shown by the dotted line in Figure 3, or in some cases, it may dissipate into the atmosphere without generating a shock wave.

[0068] As a result, in the present invention, a local pressure rise at the outlet portion, which occurs in the conventional art, does not occur.

[0069] In conclusion, according to the present invention, by increasing the pressure difference between the inlet 112 and the outlet 113 of the gas discharge passage 111, the choking phenomenon can be overcome, and a large amount of gas can be discharged while obtaining relatively stable gas fluidity without generating shock waves at the outlet, thereby improving safety.

[0070] Furthermore, since the pressure differential can be large, the burst pressure of the venting disc 120 can also be selected to be relatively high.

[0071] The shape, length, cross-sectional area size, and cross-sectional area change rate of the first flow path 111A and the second flow path 111B constituting the gas exhaust flow path 111 of the present invention can be suitably changed and selected according to design specifications such as the type, number, and arrangement of secondary batteries installed in the battery module and battery pack. That is, the heat propagation conditions, flame generation conditions, temperature, and pressure that occur within the battery module and pack vary depending on the design specifications of the secondary batteries. In addition, the number and arrangement of battery modules installed inside the battery pack must also be taken into consideration.

[0072] Therefore, various specifications such as the shape, length, and cross-sectional area of ​​the gas discharge channel 111 of the present invention can be determined in consideration of the various parameters described above.

[0073] The shape, length, size of the cross-sectional area, rate of change of the cross-sectional area, etc. of such gas discharge flow path 111 will be described later.

[0074] Meanwhile, the venting disk 120 is installed in the gas exhaust passage 111 of the bracket member 110 so as to block the gas exhaust passage. Theoretically, the venting disk 120 can be installed anywhere along the paths of the first passage 111A and the second passage 111B. In practice, the venting disk 120 can be installed in the most suitable position taking into consideration the pressure, flow rate, cross-sectional area, passage shape, ease of installation, and the like, depending on the position of the gas exhaust passage 111.

[0075] Typical examples of preferred installation positions for the venting disk 120 include the following.

[0076] First, the venting disk 120 can be installed at the throat portion T, which is the boundary between the first flow path 111A and the second flow path 111B.

[0077] The throat section T forms the cross-sectional area where subsonic behavior changes to supersonic behavior, so the cross-sectional area of ​​the throat section T must be determined as a priority when designing the flow path. If the venting disk 120 is installed at the throat section T, the area of ​​the venting disk 120 and the burst pressure range can be designed relatively accurately by taking into account the cross-sectional area at the throat section T. In particular, the flow at the throat section T is more stable than at the inlet and outlet of the gas exhaust flow path 111, and since the design is based on this stable area, there is an advantage in that the design accuracy of the venting disk 120 can be further improved.

[0078] Furthermore, since the pressure deviation before and after the throat portion T is not large, there is little possibility that the venting disc 120 will be unintentionally damaged before the set pressure is reached.

[0079] Second, the venting disk 120 may be installed on the inlet 112 side of the gas exhaust flow path 111. "Installed on the inlet side" includes both installation at the inlet 112 of the first flow path 111A that constitutes the gas exhaust flow path 111 and installation at a portion adjacent to the inlet. Furthermore, if an additional flow path is formed inside the gas venting device 100 preceding the first flow path 111A, the venting disk 120 may be installed in that additional flow path.

[0080] In this case, the venting disc 120 can be effectively protected from external pressure, and important parts such as secondary battery parts and module parts inside the venting disc 120 can be easily protected.

[0081] Furthermore, as long as the shape of the throat portion T described above is determined, the overall flow rate is not greatly affected by the size of the inlet, making it easy to select the specifications for the venting disk 120 installed at the inlet of the gas exhaust flow path 111. In other words, once the shapes of the throat portion T and the flow path are determined within a range that allows for an increase in flow velocity in response to pressure changes at the inlet and outlet, the area of ​​the inlet and the size of the venting disk 120 installed there can be suitably designed. Therefore, installing the venting disk 120 at the inlet 132 has the advantage of allowing for greater design freedom.

[0082] Third, a venting disk 120 may be installed at the outlet of the gas exhaust flow path 111, that is, on the outlet 113 side of the second flow path.

[0083] If the venting disk 120 is installed at the inlet 112 of the flow path or at the throat T, when the venting disk 120 bursts, the burst fragments may block the flow path or flow into the interior of the module, causing interference. This may result in a loss of flow stability in the flow path. Installing the venting disk 120 at the outlet 133 of the flow path reduces this risk and contributes to flow stability.

[0084] Since the venting disk 120 is located on the outlet 113 side of the flow path, there are no obstacles in the flow path from the inlet to the outlet. As a result, the flow path is connected to the outside after the gas flow in the gas exhaust flow path 111 is fully developed, which further improves the flow stability of the flow path and allows the exhaust gas to be pushed out stably.

[0085] Furthermore, if the venting disk 120 is installed on the outlet 113 side of the gas exhaust flow path 111, it can be easily replaced from outside the flow path when damaged.

[0086] As described above, the venting disk 120 may be installed at the inlet of the first flow path 111A (inlet 112 of the gas exhaust flow path), the outlet of the second flow path 111B (outlet 113 of the gas exhaust flow path), or the throat portion T which is the boundary between the outlet of the first flow path and the inlet of the second flow path. Of course, the venting disk 120 may be installed at other positions depending on the design of the flow paths.

[0087] However, as mentioned above, there are respective advantages to installing the venting disc 120 at the inlet, outlet, and throat of the first flow passage. Also, in terms of ease of coupling the venting disc 120 to the bracket member 110, it is preferable to install the venting disc 120 at the inlet or outlet side of the gas exhaust flow passage 111. That is, if the venting disc 120 is located at the inlet or outlet side of the gas exhaust flow passage 111, the gas venting device 100 can be easily assembled by, for example, contacting the venting disc 120 with the mating surface of the bracket member 110 and fastening them with fastening members.

[0088] On the other hand, when the bracket member 110 is attached so that the venting disc 120 is positioned at the throat portion T, the shape of the bracket member 110 or the gas exhaust passage 111 needs to be separately processed to provide a place where the venting disc 120 can be attached.

[0089] Therefore, in the present invention, in order to simplify the processing of the bracket member 110 and increase the bonding area between the venting disk 120 and the bracket member 110, the venting disk 120 is installed on the outlet side of the gas exhaust flow path 111, i.e., on the outlet 113 side of the first flow path 111A. Furthermore, by installing the venting disk 120 on the outlet side of the gas exhaust flow path 111, when the venting disk 120 ruptures, the ruptured fragments can be removed to the outside of the flow path by the pressure of the flow path. This prevents the ruptured fragments from blocking the flow path or flowing into the interior of the module and causing interference. Furthermore, by installing the venting disk 120 on the side of the flow path outlet 113, the venting disk 120 does not obstruct the flow in the flow path, so the flow path is fully developed before the gas flow in the gas exhaust flow path 111 is fully developed and connected to the outside. This ensures stable flow in the flow path and allows gas to be expelled stably.

[0090] In the following, an embodiment will be described in which the venting disk is installed on the outlet side of the gas discharge flow path, that is, on the outlet 113 side of the second flow path 111B.

[0091] The length, shape, cross-sectional area size, and rate of change of cross-sectional area of ​​the first flow path 111A and the second flow path 111B can be suitably designed taking into consideration the design specifications of the secondary battery, battery module, and battery pack, required safety, gas flow stability, etc.

[0092] 5 to 7 are diagrams showing the flow path shapes of gas venting devices according to various embodiments of the present invention.

[0093] The overall length of the gas exhaust flow path, or the lengths of the first flow path 111A and the second flow path 111B, can be determined in consideration of the gas exhaust pressure, the cross-sectional area of ​​the flow path, the size of the module or pack, and the like.

[0094] For example, as shown in Figures 3 and 4, the first flow path 111A and the second flow path 111B may be configured to have the same length, which is applicable when the change in gas flow rate is relatively simple, and the processing of the bracket member 110 is easy.

[0095] However, as shown in Figures 5 and 6, it is also possible to make the lengths of the first flow path 111A and the second flow path 111B different. In particular, the length of the first flow path 111A, which is the subsonic section, can be shortened, and the length of the second flow path 111B, which is the supersonic section, can be lengthened. By shortening the first flow path 111A and lengthening the second flow path 111B, choking in the throat section T can be quickly eliminated, and gas can be discharged from the outlet with the supersonic flow in the second flow path 111B fully developed. This increases the flow inertia of the discharged gas, and the shock wave generation section can be formed farther from the outlet.

[0096] The cross-sectional area of ​​the first flow path 111A decreases continuously or sequentially along the gas discharge direction. When the cross-sectional area of ​​the first flow path 111A decreases continuously, the cross-sectional profiles of both sides of the first flow path 111A form a tapered shape approaching each other in the gas discharge direction. Here, both sides of the flow path refer to both sides that form the inner circumferential wall of the flow path, not the inlet and outlet sides that form the upper and lower parts of the flow path.

[0097] Furthermore, when the cross-sectional area of ​​the second flow path 111B increases continuously along the gas discharge direction, the cross-sectional profiles of both sides of the second flow path form a tapered shape that moves away from each other in the gas discharge direction.

[0098] In addition to the lengths of the first and second flow paths, the taper slopes of the cross-sectional profiles of the side portions may also be determined differently depending on the design objectives. That is, when the flow change is relatively simple or the venting path is short, the taper slopes of the first and second flow paths may be set to the same, as shown in Figures 3 and 4. On the other hand, when the flow pattern is complex and from the perspective of preventing choking and shock waves, the taper slope of the first flow path 111A may be made greater than the taper slope of the second flow path 111B, as shown in Figures 5 and 6.

[0099] Meanwhile, the cross-sectional profile of the both side portions is not limited to a linear tapered shape, but may include a curved tapered shape. For example, the cross-sectional profiles of the first and second flow paths may both be linearly tapered as shown in FIG. 5(a), or may both be curvedly tapered as shown in FIG. 5(b). Alternatively, the cross-sectional profiles of both side portions of the first flow path 111A and the second flow path 111B may be configured with a mixture of linear and curved shapes. That is, as shown in FIG. 6(a), the cross-sectional profile of the first flow path 111A may be curved, and the cross-sectional profile of the second flow path 111B may be straight. Alternatively, as shown in FIG. 6(b), the cross-sectional profiles of the first and second flow paths may be configured with a combination of straight and curved shapes.

[0100] Furthermore, even within each of the first flow path 111A and the second flow path 111B, the cross-sectional profile may be configured in a form in which straight lines and curves are partially mixed. What is important is that the cross-sectional area condition of the entire flow path must be satisfied, that is, the cross-sectional area continuously or sequentially decreases (first flow path) and increases (second flow path).

[0101] The curvature of the curve may be set to be different for each flow path, or may be set to be different within one flow path along the gas discharge direction. For example, the curved tapered flow paths in Figures 5 and 6 are curved in a concave shape from the center of the flow path toward the inner wall of the flow path, but it is also possible to configure a curved flow path in a convex shape that protrudes from the inner wall of the flow path toward the center of the flow path.

[0102] When the cross-sectional profile of both sides of the flow channel is configured in a form in which straight lines and curves are mixed, or in a form in which the curvature of the curves is different, the following effects are obtained.

[0103] For example, if the cross-sectional profile of a flow channel is linear, it is simple and easy to manufacture, but when connected to other components such as pipes, angular portions may be formed on the wall of the flow channel, resulting in sections where the flow is unstable. Also, because the cross-sectional area reduction rate is constant, for example, when an unstable gas flows into the inlet of the flow channel, the flow instability of the gas is likely to persist until the outlet of the flow channel. In other words, a flow channel with a constant cross-sectional area reduction or increase rate has the disadvantage of reducing the degree of freedom in adjusting the flow instability within the flow channel.

[0104] In contrast, when the cross-sectional area reduction rate varies depending on the flow path (for example, when the cross-sectional profile of both sides is a mixture of straight and curved lines, or when the curvature of the curves is different), the flow instability can be adjusted or controlled within the flow path. For example, as shown in FIG. 6, when the first and second flow paths have different shapes or profiles on both sides, even if the flow in the first flow path 111A is unstable, the flow can be stabilized by appropriately designing the shape of the second flow path 111B. In this way, by making the shapes of the first and second flow paths different, or by designing the shape or cross-sectional profile within a single flow path to be different, the gas flow within the flow path can be adjusted, thereby increasing the design freedom for adjusting flow stability.

[0105] In addition, as described above, by adjusting the lengths of the first and second flow paths and the inclination of the tapered shape, the degree of freedom in design for adjusting the flow stability can be further increased.

[0106] On the other hand, the cross section of the gas discharge flow path 111 perpendicular to the gas discharge direction may be designed to be circular, as shown in Fig. 3. In this case, the three-dimensional shape of the gas discharge flow path 111 is a truncated cone. As a result, the cross section of the inlet 112 of the first flow path 111A of the gas discharge flow path 111, the throat portion T, and the outlet 113 of the second flow path 111B also have circular shapes.

[0107] Here, the first flow path 111A of the gas discharge flow path 111 has a first truncated cone 111C shape with both side portions having a linear or curved tapered cross-sectional profile, and the second flow path 111B has a second truncated cone 111D shape with both side portions having a linear or curved tapered cross-sectional profile.

[0108] Specifically, in the gas discharge flow path 111 of FIG. 5, the first and second truncated cone-shaped outer peripheral surfaces that form the first and second flow paths, respectively, have a linear or curved cross-sectional profile.

[0109] In addition, in the gas discharge flow path of Figure 6, the first truncated cone-shaped outer surface forming the first flow path 111A has a cross-sectional profile that is curved (Figure 6(a)) or straight (Figure 6(b)), and the second truncated cone-shaped outer surface forming the second flow path 111B has a cross-sectional profile that is straight (Figure 6(a)) or curved (Figure 6(b)).

[0110] As described above, by changing or mixing the cross-sectional profiles of the first and second truncated cones 111C and 111D, it is possible to more effectively adjust the flow stability as described above.

[0111] 4 to 6, the cross section perpendicular to the gas discharge direction is circular, and the first and second flow paths each have a truncated cone shape. However, the cross section is not limited to a circle, and may have a rectangular cross section as shown in FIG.

[0112] That is, as long as the cross-sectional areas of the first and second flow paths satisfy the conditions for decreasing and increasing, respectively, it is also possible to adopt a flow path having a rectangular cross-sectional shape perpendicular to the gas exhaust flow path, as shown in FIG. 7. Referring to FIG. 7, the first flow path 111A has a first truncated pyramid 111E shape with tapered cross-sectional profiles on both sides, and the second flow path 111B has a second truncated pyramid 111F shape with tapered cross-sectional profiles on both sides. In the gas exhaust flow path of FIG. 7, the first truncated pyramid 111E and the second truncated pyramid 111F each have a trapezoidal cross-sectional profile on both sides. A gas exhaust flow path having such a rectangular cross-sectional shape may also be preferably adopted for design purposes or for adjusting flow stability.

[0113] In this way, a flow path having a rectangular (quadrilateral) cross-sectional shape perpendicular to the gas discharge direction that is not circular, i.e., a flow path whose three-dimensional shape forms a truncated pyramid, can also be applied to flow paths having cross-sectional profiles on both sides shaped as shown in Figures 5 and 6 in addition to Figure 7.

[0114] 7(a) and 7(b), a straight flow path 115 may be additionally formed inside the gas exhaust flow path 111, i.e., inside the first flow path 111A, as needed. Adding the straight flow path 115 in this way allows the flow of fluid inside the gas venting device 100 to be stably guided toward the first flow path 111A. Furthermore, if the straight flow path 115 is included inside the bracket member 110, it is easy to introduce a tool for processing the flow path inside the bracket member 110, which may be advantageous in terms of ease of processing.

[0115] The linear flow path 115 has a rectangular cross section perpendicular to the gas discharge direction, but a circular flow path, that is, a flow path having a cylindrical three-dimensional shape, is also possible.

[0116] Such a linear flow channel 115 can be applied to the inlet side of the truncated cone flow channels of FIGS. 4 to 6 in addition to the truncated pyramid flow channel of FIG.

[0117] FIG. 8 shows a gas venting device according to another embodiment of the present invention, where (a) of FIG. 8 is a schematic cross-sectional view, and (b) of FIG. 8 is a perspective view of an exhaust guide 130, which is a component of the gas venting device.

[0118] In the above-described FIGS. 3 to 7, the through-hole itself of the bracket member 110 is formed as the gas discharge flow path 111 including the first flow path 111A and the second flow path 111B.

[0119] However, this makes it difficult to easily change the flow path shape in response to changes in product specifications, and in order to change the flow path, it is inconvenient that the bracket member itself must be replaced with a bracket member 110 having a different flow path shape.

[0120] 8, the object of the present invention is achieved by inserting an exhaust guide 130 having a gas exhaust passage 131 formed therethrough into the through-hole of the bracket member 110. That is, in this embodiment, a gas exhaust passage consisting of the first passage and the second passage is formed through the exhaust guide 130, and the exhaust guide 130 is coupled to the through-hole of the bracket member 110. At the same time, a venting disk 120 is coupled to the bracket member 110 and the exhaust guide 130 at the outlet 133 of the gas exhaust passage 131 of the exhaust guide 130. As shown in FIG. 8, the gas exhaust passage 131 of the exhaust guide 130 has a shape in which a first passage shaped like a first truncated cone 131C and a second passage shaped like a second truncated cone 131D are continuously formed, with the tapered cross-sectional profiles of both sides thereof being in opposite directions.

[0121] The exhaust guide 130 has a detachable or replaceable structure. As described above, in this embodiment, by using a separate exhaust guide 130 having a gas exhaust passage 131 on the bracket member 110, gas exhaust is facilitated, parts can be easily replaced, and the shape of the passage can be easily changed. In this case, the explanations regarding the length, inclination, and shape of the gas exhaust passage 111 described with reference to Figures 4 to 7 above can be equally applied to the gas exhaust passage 131 of the exhaust guide 130.

[0122] 9 and 10 are diagrams showing the fastening structure of the gas venting device of the present invention.

[0123] Referring to FIG. 9 , the discharge guide 130 has a fastening portion 135 formed on its outer circumferential surface for fastening the discharge guide 130 to the bracket member 110. For example, the bracket member 110 and the discharge guide 130 can be fastened together by a fastening member 140 such as a bolt. In this case, as shown in FIG. 9 (a), the fastening portion 135 for fastening the discharge guide to the bracket member 110 protrudes from the outer circumferential surface of the discharge guide 130. Since the discharge guide 130 must be inserted into a through-hole in the bracket member 110, the cross section of the discharge guide 130 has a shape corresponding to the shape of the through-hole. The fastening portion 135 has a plate-like protrusion shape that protrudes along its outer circumferential portion in the same shape as the outer circumferential portion of the venting disk 120. The fastening portion 135 has a fastening hole (not shown) formed in the fastening portion 135 for fastening to the bracket member 110 with a bolt. The fastening hole formed in the fastening portion 135 is formed at the same position as the fastening hole formed in the bracket member 110 and is fixed by inserting a bolt.

[0124] Meanwhile, the position where the fastening portion 135 is formed can be suitably designed. For example, as shown in Fig. 9(a), the fastening portion 135 can be formed to be located between the bracket member 110 and the venting disc 120. Alternatively, the fastening portion can be formed to contact a surface other than the surface of the bracket member 110 that contacts the venting disc 120.

[0125] In another example, the bracket member 110 and the discharge guide 130 may be coupled together using a screw fastening method. In this case, as shown in FIG. 9(b), threads 116 and 136 for screw fastening may be formed on the inner wall of the through hole of the bracket member 110 and the outer peripheral surface of the discharge guide 130, respectively, so that they correspond to each other. As a result, the bracket member 110 and the discharge guide 130 may be fastened together in the same manner as a nut and a bolt are fastened together. When the discharge guide 130 is fastened to the bracket member 110 using a screw fastening method, the component structure and fastening method are simplified, and the discharge guide 130 may be firmly fixed to the bracket member 110. However, even in this case, a separate fastening member 140, such as a bolt, is required to fasten the bracket member 110 and the venting disk 120 together.

[0126] The shapes of the gas discharge passages 111 and 131 formed in the bracket member 110 or the discharge guide 130 can be designed in various forms according to safety standards of the battery pack.

[0127] The cross-sectional area of ​​the throat portion T of the gas discharge flow passages 111, 131 can be suitably selected depending on the structure of the battery module and battery pack or the safety conditions to be achieved, and may be 20% to 80% of the cross-sectional area of ​​the inlet of the gas discharge flow passage (first flow passage inlet 112, 132). Specifically, the cross-sectional area of ​​the throat portion may be 20% to 40%, 40% to 60%, or 60% to 80%, more specifically 55% to 65% of the inlet cross-sectional area.

[0128] The cross-sectional area of ​​the outlets 113, 133 (outlets of the second flow paths) of the gas exhaust flow paths 111, 131 may be the same as or different from the cross-sectional area of ​​the inlets.

[0129] Meanwhile, a pattern (not shown) for assisting gas discharge may be formed on the inner wall of the gas discharge channels 111, 131. For example, the pattern may be in the form of a thread, an embossment, or a protrusion having a linear pattern parallel to the gas discharge direction. Specifically, the pattern may be in the form of a thread protrusion that wraps around the inside of the channel along the inner wall of the channel. Such a pattern may facilitate gas discharge.

[0130] FIG. 11 is a schematic diagram showing the shape of a venting disk 120 according to the present invention.

[0131] The venting disk 120 includes a disk outer periphery 121 fastened to the bracket member 110, and a disk inner periphery 122 integrally formed with the disk outer periphery 121, blocking the through-hole, and bursting when a predetermined pressure is applied.

[0132] The disk outer periphery 121 is a portion for fixing the bracket member 110 and the venting disk 120. The disk outer periphery 121 may have bolt through holes 123 formed along the circumferential direction, and the bracket member 110 and the disk outer periphery 121 may be integrally coupled to each other by a bolt fastening method or the like.

[0133] The inner disk 122 may be made of a metal or plastic material that can burst when a predetermined pressure is applied. For example, the inner disk 122 may be made of a thin metal such as copper, aluminum, or stainless steel, or a plastic material. The material of the inner disk 122 may be appropriately selected depending on the pressure conditions at the time of bursting.

[0134] Under normal conditions, the disk inner circumference 122 blocks the through-holes formed in the bracket member 110, thereby preventing moisture or foreign substances from penetrating into the battery module or battery pack. However, if a large amount of gas is generated in the battery module or battery pack, the internal pressure increases, and this pressure acts as a force that can rupture the disk inner circumference 122. At this time, since the pressure inside the battery module or battery pack is higher than the external atmospheric pressure, the internal gas can be discharged to the outside of the battery module or battery pack due to negative pressure.

[0135] The inner periphery 122 of the disk has a notch 124 formed therein so as to rupture when a predetermined pressure is applied. The notch 124 is formed by partially cutting out the surface of the venting disk 120 in the thickness direction. The shape of the notch 124 may be designed as a cross, a circular rectangle, a U-shape, an ellipse, an arc, or the like, and the cross section of the notch 124 may be a trapezoid, a V-shape, a square, an arc, or the like. The shape of the notch 124 formed in the inner periphery 122 of the disk is not limited thereto and may have various other shapes. For example, the notch 124 may have an X-shape as shown in FIG. 11 . In this case, even if the inner periphery 122 of the disk ruptures, the ruptured fragments of the inner periphery 122 of the disk may not rupture completely but may be connected to the outer periphery 121 of the disk. If the ruptured fragments of the inner periphery of the disk rupture completely and become separated from the venting disk, they may be difficult to remove and may damage other components.

[0136] In addition, a disc pad (not shown) may be interposed between the bracket member 110 and the venting disc 120. The disc pad may be provided in an annular or ring shape corresponding to the disc outer periphery 121. The disc pad serves to increase airtightness between the bracket member 110 and the venting disc 120 and prevent damage to the disc outer periphery 121. For example, the disc pad may be made of an elastic rubber material.

[0137] The present invention also provides a battery module including the gas venting device described above.

[0138] FIG. 12 is a schematic diagram showing a coupling structure of a gas venting device in a battery module according to one embodiment of the present invention.

[0139] Referring to FIG. 12, the battery module 200 according to the present invention includes a plurality of secondary batteries (not shown) and a module frame 210 on which the secondary batteries are mounted, and has a structure in which the gas venting device 100 as described above is fastened to one side of the module frame 210.

[0140] Specifically, the secondary battery has a shape in which an electrode assembly, in which a positive electrode, a negative electrode, and a separator are alternately stacked, is mounted in a cell case together with an electrolyte. The configuration of such a secondary battery is obvious to those skilled in the art, and therefore, a detailed description thereof will be omitted.

[0141] In one example, the gas venting device 100 may be fastened with the bracket member 110 in contact with the outer surface of the module frame 210 as shown in Fig. 12(a) or with the bracket member 110 in contact with the inner surface of the module frame 210 as shown in Fig. 12(b). In the present specification, the inner surface of the module frame 210 refers to the surface of the module frame 210 facing the internal space in which the secondary batteries are mounted, and the outer surface refers to the surface exposed to the outside of the module frame 210. The module frame 210 has fastening holes formed in fastening portions (not shown) of the bracket member 110 and the discharge guide 130, and holes corresponding to the bolt through holes of the venting disk 120, so that the bracket member 110, the venting disk 120, and the discharge guide 130 can be fixed to the module frame 210 by fastening with a single bolt. Furthermore, the module frame 210 has holes of a size corresponding to the through holes formed in the bracket member 110 or the inlets of the gas exhaust flow paths 131 formed in the exhaust guide 130, so that gas generated within the module can be exhausted.

[0142] Meanwhile, the battery module 200 may further include a sealing member (not shown) that seals the gap between the module frame 210 and the outer periphery of the gas venting device 100. The sealing member may be a rubber ring or a silicone resin, and may be installed in the gap between the gas venting device and the module frame to seal the battery module.

[0143] As shown in FIG. 12, when the venting disc 120 is installed on the outlet 113, 133 side of the gas exhaust flow passage 111, 131 of the gas venting device 100 or exhaust guide, even if the venting disc 120 bursts, the burst fragments can be immediately discharged to the outside of the flow passage 111, 131. This makes it easy to prevent the flow passage from being contaminated by the fragments. Furthermore, if the venting disc 120 bursts, the venting disc 120 can be easily replaced from the outside of the module frame 210. Furthermore, in the present invention, the venting disc 120 is disposed on the outlet side of the flow passage, and there is no structure inside the flow passage that obstructs the flow. Therefore, the flow in the flow passage can be fully developed, allowing gas to be discharged as designed, thereby ensuring flow stability.

[0144] The present invention also provides a battery pack including the gas venting device described above.

[0145] A battery pack according to the present invention includes at least one battery module including a plurality of secondary batteries, and a battery pack case in which the battery module is mounted, and the gas venting device as described above may be fastened to one side of the battery pack case.

[0146] In this case, the gas venting device can be fastened to the battery pack case in the same manner as the above-described coupling between the module frame and the gas venting device.

[0147] That is, in the gas venting device, the bracket member 110 can be coupled to the inner surface or the outer surface of the battery pack case.

[0148] Similarly, the battery pack may include a sealing member that provides a seal between the battery pack case and the outer periphery of the gas venting device.

[0149] As described above, in the gas venting device according to the present invention, and the battery module and battery pack equipped with the same, when the internal pressure exceeds a reference value while the interior is sealed, the venting disc bursts, and the gas inside the battery pack is discharged to the outside.

[0150] The present invention employs a continuous gas exhaust passage in which the cross-sectional area of ​​the gas exhaust passage decreases continuously or sequentially in the gas exhaust direction and then increases again, thereby overcoming the conventional limitation of the outlet flow velocity remaining subsonic, which causes choking, and enabling the outlet flow velocity of the gas exhaust passage to exceed supersonic speed, thereby discharging a larger flow rate of gas.

[0151] Furthermore, as described above, the stability of the gas flow at the outlet portion is greatly improved, and the occurrence of shock waves can be reduced or prevented.

[0152] In particular, in the present invention, the venting disk is installed on the outlet side of the gas exhaust flow path, thereby achieving the above-mentioned unique effect.

[0153] The above description merely exemplifies the technical concept of the present invention, and various modifications and variations may be made by a person skilled in the art without departing from the essential characteristics of the present invention. Therefore, the drawings disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such drawings. The scope of protection of the present invention should be interpreted by the following claims, and all technical concepts within the scope equivalent thereto should be interpreted as being within the scope of the present invention.

[0154] Although terms indicating directions such as up, down, left, right, front, and back are used in this specification, it is obvious that these terms are used merely for convenience of explanation and may change depending on the position of the object in question, the position of the observer, etc. [Explanation of symbols]

[0155] 100: Gas venting device 110: Bracket member 111: Gas exhaust flow path 111A: First flow path 111B: Second flow path 111C: First truncated cone 111D: Second truncated cone 111E: 1st truncated pyramid 111F:Second truncated pyramid 112:Entrance 113: Exit T: Throat 115: Straight flow path 116:Thread 120: Venting disc 121: Outer periphery of the disc 122: Inner circumference of the disc 123: Bolt through hole 124: Notch 130: Ejection guide 131: Gas exhaust flow path 131A: First flow path 131B: Second flow path 131C: First truncated cone 131D: Second truncated cone 132: Entrance 133:Exit 135: Fastening part 136:Thread 140: Fastening member 200: Battery module 210: Module frame

Claims

1. a hollow bracket member having a gas exhaust flow path; a venting disk coupled to the bracket member to block the gas exhaust flow path and configured to burst when a predetermined pressure is applied, The gas exhaust flow path is a first flow path whose cross-sectional area decreases continuously or sequentially along a gas discharge direction; a second flow path formed continuously with the first flow path, the cross-sectional area of ​​which increases continuously or sequentially along the gas discharge direction, The venting disk is installed on the outlet side of the gas exhaust flow path, A gas venting device, wherein a flow path having linear cross-sectional profiles on both sides is connected to an inlet side of the first flow path.

2. 2. The gas venting apparatus of claim 1, wherein the first and second flow paths have the same or different lengths.

3. The cross-sectional profiles of both sides of the first flow path are formed in a tapered shape approaching each other in a gas discharge direction, The gas venting device according to claim 1 , wherein the cross-sectional profiles of both sides of the second flow passage are tapered away from each other in the gas discharge direction.

4. 4. The gas venting apparatus of claim 3, wherein the tapered slope of the first flow passage and the tapered slope of the second flow passage are the same or different.

5. 4. The gas venting device according to claim 3, wherein the cross-sectional profiles of both sides of the first flow passage and the second flow passage are formed in a linear or curved tapered shape.

6. The first flow path has a first truncated cone shape in which the cross-sectional profile of both sides is formed into a linear or curved tapered shape, 6. The gas venting apparatus according to claim 5, wherein the second flow passage has a second truncated cone shape with cross-sectional profiles of both sides formed in a linear or curved tapered shape.

7. the first flow path has a first truncated pyramid shape in which cross-sectional profiles of both side portions are formed in a tapered shape, 4. The gas venting apparatus according to claim 3, wherein the second flow passage has a second truncated pyramidal shape with cross-sectional profiles at both sides formed in a tapered shape.

8. 8. The gas venting apparatus of claim 7, wherein the first truncated pyramidal shape and the second truncated pyramidal shape are quadrangular truncated pyramidal shapes having trapezoidal cross-sectional profiles.

9. the bracket member has a through hole; a discharge guide inserted into the through hole and having the gas discharge flow path formed therethrough; 2. The gas venting device according to claim 1, wherein the venting disk is coupled to the bracket member and the exhaust guide at an outlet side of the gas exhaust flow path of the exhaust guide, thereby blocking the gas exhaust flow path.

10. 10. The gas venting apparatus according to claim 9, wherein a fastening portion for fastening the exhaust guide to the bracket member is formed on an outer peripheral surface of the exhaust guide.

11. 10. The gas venting apparatus according to claim 9, wherein the bracket member and the exhaust guide are coupled together by a screw fastening method.

12. The venting disc is a disk outer periphery connected to the bracket member; an inner peripheral portion of the disk that is formed integrally with the outer peripheral portion of the disk, blocks the gas discharge flow path, and bursts when a predetermined pressure is applied; 2. The gas venting device according to claim 1, wherein a notch is formed in the inner periphery of said disk so as to burst when said predetermined pressure is applied.

13. A plurality of secondary batteries; a module frame on which the secondary battery is mounted, A battery module, wherein the gas venting device according to any one of claims 1 to 12 is coupled to one side of the module frame.

14. The battery module according to claim 13 , further comprising a sealing member for sealing between the module frame and an outer periphery of the gas venting device.

15. at least one battery module including a plurality of secondary batteries; a battery pack case in which the battery module is mounted, A battery pack having the gas venting device according to any one of claims 1 to 12 coupled to one side of the battery pack case.

Images