Gas venting device, battery module and battery pack including the same

Abstract

The present invention relates to a gas venting device, and a battery module and a battery pack including the same, which can exhaust a larger flow rate of gas even when using a venting disk of the same area by decreasing and increasing the cross-sectional area of ​​the flow path depending on the gas exhaust direction. Furthermore, by installing a venting disk on the inlet side of the gas exhaust passage, it is possible to achieve effects such as protecting the internal parts.

Description

Technical Field

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

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

[0003] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0072872 filed on June 15, 2022, and all the contents disclosed in the literature of the Korean patent application are included as part of this specification.

Background Art

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

[0005] Gas can be generated inside a secondary battery at any time during use while repeatedly charging and discharging, and this is called venting gas. For example, when an overcurrent flows, the temperature inside the secondary battery rapidly rises. Such a rapid rise in temperature causes a decomposition reaction of the electrolyte, so gas can be generated. When gas is generated inside the secondary battery in a battery pack, such gas can be collected inside the pack and the battery pack can explode, or can flow into the inside of a vehicle or the like through a cooling duct of the battery pack. Therefore, a venting device for discharging the internal gas to the outside and reducing the internal pressure is provided in the battery pack.

[0006] A venting device typically has a structure in which a venting disc, which can rupture depending on the internal pressure, is inserted between an inlet where gas from inside the battery module or battery pack flows in and an outlet where the gas is discharged.

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

[0008] As shown in the diagram, the conventional gas venting device 1 has the advantage of being easy to design because the gas discharge passage 11 of the bracket 10 that communicates with the venting disc 20 is simply designed in a cylindrical shape.

[0009] However, conventional gas venting devices 1 have a cylindrical structure in which the gas inlet 12 and outlet 13 are simply connected, and therefore the pressure between the inlet and outlet is not large enough, which limits the flow rate of gas that can be discharged.

[0010] Furthermore, when a large amount of gas is generated, a so-called choking phenomenon may occur at the outlet of the gas discharge channel 11, causing flow stagnation and increasing flow instability. To avoid such choking, it is necessary to set the venting disc so that it can burst at low pressure. However, considering the burst pressure tolerance, ensuring the reliability of the venting disc components can be difficult in this case.

[0011] Furthermore, as illustrated in Figure 2, in a gas venting device with a cylindrical flow path 11, there is a problem in that unstable flow at the outlet and rapid pressure changes at the outlet generate a strong shock wave near the outlet, compromising safety.

[0012] Furthermore, a localized pressure increase occurs downstream of the shock wave, which can lead to a re-increase in outlet pressure. This can result in a decrease in the pressure difference between the inlet and outlet, potentially reducing the discharge flow rate. [Prior art documents] [Patent Documents]

[0013] [Patent Document 1] Korean Published Patent No. 10-2018-0039986 [Overview of the project] [Problems that the invention aims to solve]

[0014] The present invention was devised to solve the above-mentioned problems, and aims 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, a battery module including the same, and a battery pack.

[0015] Furthermore, the objective is to provide a gas venting device that can eliminate the chalking phenomenon at the outlet and increase the burst pressure of the venting disc.

[0016] Furthermore, the present invention provides a gas venting device that enhances safety by preventing the generation of shock waves at the outlet of the flow path and further improves flow stability.

[0017] Furthermore, the present invention provides a gas venting device that protects the internal components of battery modules and packs on which the gas venting device is installed, by installing the venting disc on the inlet side of the flow path, and that increases the design flexibility of the venting disc. [Means for solving the problem]

[0018] The gas venting device of the present invention for solving the above problems includes a hollow bracket member having a gas discharge flow path, and a venting disk coupled to the bracket member to shield the gas discharge flow path and configured to rupture when a predetermined pressure is applied. The gas discharge flow path includes a first flow path in which the flow path cross-sectional area continuously or sequentially decreases along the gas discharge direction, and a second flow path continuously formed with the first flow path and in which the flow path cross-sectional area continuously or sequentially increases along the gas discharge direction. The venting disk is installed on the inlet side of the gas discharge flow path.

[0019] The first flow path and the second flow path may have the same or different lengths.

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

[0021] The tapered inclination of the first flow path and the tapered inclination of the second flow path may be the same or different.

[0022] Also, 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 frustum shape in which the cross-sectional profiles of both sides are formed in a linear or curved tapered shape, and the second flow path may have a second frustum shape in which the cross-sectional profiles of both sides are formed in a linear or curved tapered shape.

[0024] As another example, the first flow path may have a first frustum pyramid shape in which the cross-sectional profiles of both sides are formed in a tapered shape, and the second flow path may have a second frustum pyramid shape in which the cross-sectional profiles of both sides are formed in a tapered shape.

[0025] At this time, the first frustum-shaped pyramid and the second frustum-shaped pyramid may have a frustum-shaped pyramid cross-sectional profile with a trapezoidal shape.

[0026] Also, a flow path with a linear cross-sectional profile on both sides may be connected to the inlet side of the first flow path.

[0027] As an example, the bracket member includes a through hole, the gas venting device is inserted into the through hole, includes a discharge guide in which the gas discharge flow path is formed through, and the venting disk is coupled to the bracket member and the discharge guide on the inlet side of the gas discharge flow path of the discharge guide to shield the gas discharge flow path.

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

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

[0030] On the other hand, the venting disk includes a disk outer peripheral portion coupled to the bracket member, and a disk inner peripheral portion formed integrally with the disk outer peripheral portion, shielding the gas discharge flow path, and rupturing when a predetermined pressure is applied. A notch may be formed in the disk inner peripheral portion so as to rupture when the predetermined pressure is applied.

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

[0032] The battery module includes a plurality of secondary batteries and a module frame on which the secondary batteries are mounted, and the above-described 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 having a plurality of secondary batteries, and a battery pack case on which the battery module is mounted, and a 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 according to the present invention and the battery module or battery pack including it can improve the safety of the battery module and battery pack by discharging a greater flow rate per unit time, even when using a venting disk of the same area.

[0036] Furthermore, because it has a unique gas discharge channel shape, even if a large amount of venting gas is generated, it is possible to obtain a relatively stable gas flow at the outlet while eliminating the chalking phenomenon. In addition, since it is possible to increase the pressure difference between the inlet and outlet while avoiding the chalking phenomenon, it has the advantage of being able to select a relatively high burst pressure for the venting disc.

[0037] Furthermore, the emitted gas is released at a high speed, and this high-speed flow inertia may cause shock waves to be generated far from the outlet, or it may prevent the generation of shock waves altogether.

[0038] Furthermore, by installing the venting disc on the inlet side of the flow path, the present invention protects the internal components of the battery module and pack on which the gas venting device is installed, and increases the design flexibility of the venting disc.

[0039] As a result, the gas venting device of the present invention, the battery module and battery pack including it, have the advantage of being able to significantly improve safety even when events such as heat propagation occur. [Brief explanation of the drawing]

[0040] [Figure 1]This is a perspective view showing an example of a conventional gas venting device. [Figure 2] This is a schematic diagram showing the gas flow conditions at the outlet of a conventional gas venting device. [Figure 3] This is a drawing showing one embodiment of the gas venting device of the present invention. [Figure 4] This is a schematic diagram showing the gas flow conditions at the outlet of the gas venting device of the present invention. [Figure 5] This is a drawing showing the flow path shape of a gas venting device according to one embodiment of the present invention. [Figure 6] This is a drawing showing the flow path shape of a gas venting device according to another embodiment of the present invention. [Figure 7] This is a drawing showing the flow path shape of a gas venting device according to another embodiment of the present invention. [Figure 8] This drawing shows a gas venting device according to another embodiment of the present invention. [Figure 9] This is a drawing showing the fastening structure of the gas venting device of the present invention. [Figure 10] Figure 9 is a perspective view of the gas venting apparatus. [Figure 11] This is a schematic diagram showing the shape of the venting disc according to the present invention. [Figure 12] This is a schematic diagram showing the coupling structure of a gas venting device in a battery module according to one embodiment of the present invention. [Modes for carrying out the invention]

[0041] The gas venting device of the present invention includes a hollow bracket member having a gas discharge channel, and a venting disc coupled to the bracket member to shield the gas discharge channel and configured to rupture when a predetermined pressure is applied, wherein the gas discharge channel includes a first channel whose cross-sectional area decreases continuously or sequentially along the gas discharge direction, and a second channel formed continuously with the first channel whose cross-sectional area increases continuously or sequentially along the gas discharge direction, and the venting disc is installed on the inlet side of the gas discharge channel.

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

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

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

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

[0046] The present invention will now be described in detail. Before that, however, the terms and words used herein and in the claims should not be interpreted in a manner limited to their ordinary or dictionary meanings, but rather should be interpreted as meanings and concepts consistent with the technical idea of ​​the present invention, based on the principle that an inventor may appropriately define the concepts of terms in order to best describe his own invention.

[0047] In this application, terms such as “includes” and “have” should be understood as intending to specify the existence of features, numbers, stages, actions, components, parts, or combinations thereof described in the specification, without prejudice to the existence or possibility of adding one or more other features, numbers, stages, actions, components, parts, or combinations thereof. Furthermore, when a part such as a layer, film, region, or plate is said to be “on top” of another part, this includes not only when it is “directly on top” of the other part, but also when there is another part in between. Conversely, when a part such as a layer, film, region, or plate is said to be “below” another part, this includes not only when it is “directly below” the other part, but also when there is another part in between. Furthermore, in this application, being “placed on top” may include being placed not only at the top but also at the bottom.

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

[0049] Figure 3 is a drawing showing one embodiment of the gas venting device of the present invention, and Figure 4 is a schematic diagram showing the gas flow situation at the outlet of the gas venting device of the present invention. Figure 3(a) is a schematic cross-sectional view of the gas venting device, and Figure 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 discharge passage 111, and a venting disc 120 coupled to the bracket member 110 to shield the gas discharge passage 111 and configured to rupture when a predetermined pressure is applied, wherein the gas discharge passage 111 includes a first passage 111A whose cross-sectional area decreases continuously or sequentially along the gas discharge direction, and a second passage 111B formed continuously with the first passage, whose cross-sectional area increases continuously or sequentially along the gas discharge direction, and the venting disc 120 is installed on the inlet 112 side of the gas discharge passage 111.

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

[0052] The bracket member 110 is formed in a hollow shape, and this hollow (through-hole) space can directly form the gas discharge channel 111. Alternatively, as will be described later, another member having a gas discharge channel (for example, a discharge guide) can be positioned within this hollow space. In the embodiment shown in Figure 3, the bracket member 110 has a through-hole approximately in the center, and this through-hole forms the gas discharge channel 111.

[0053] The bracket member 110 is provided with a venting disc 120 that shields the gas discharge channel 111. The venting disc 120 is made of a material that can burst when a predetermined pressure is applied. For example, it can be made of a burstable metal or plastic material. Alternatively, it can be made of a polymer material that can be made into a thin film, such as vinyl or film. On the other hand, a notch may be provided in the part of the venting disc 120 corresponding to the channel to facilitate bursting.

[0054] The specified pressure described above can be determined considering the battery design conditions within the battery module or battery pack and the required level of safety. For example, the venting disc 120 may be designed to rupture if a flame occurs inside the module or pack, or if the set high temperature and pressure are exceeded. Alternatively, for increased safety, the venting disc 120 may be designed to rupture at a relatively low set pressure, which is the pressure before an explosion occurs inside.

[0055] The venting disc 120 is positioned on the gas discharge channel 111 so as to shield the gas discharge channel 111 and is coupled to the bracket member 110.

[0056] The gas discharge channel 111 includes a first channel 111A in which the channel cross-sectional area decreases continuously or sequentially along the gas discharge direction, and a second channel 111B formed continuously with the first channel in which the channel cross-sectional area increases continuously or sequentially along the gas discharge direction. In this way, by forming two channels with different channel cross-sectional areas in succession, the present invention can eliminate the choking phenomenon, increase the outlet flow velocity to discharge a large amount of gas, prevent the generation of shock waves and improve flow stability, as described below.

[0057] Generally, a battery pack is equipped with numerous battery modules, each containing multiple rechargeable batteries. When these rechargeable batteries undergo repeated charging and discharging, they generate gas due to the decomposition reaction of the electrolyte. The heat generated during the charging and discharging process of the batteries promotes gas generation, 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 flow into the vehicle or other interior through ducts, etc. Therefore, a venting device is attached that releases the gas by rupturing a venting disc 120 when the gas pressure exceeds a predetermined level.

[0058] As mentioned above, conventional venting devices have a cylindrical gas discharge channel in which the gas inlet and outlet are simply connected, and therefore the pressure difference between the inlet and outlet is not large, which limits the amount of gas that can be discharged.

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

[0060] When the cross-sectional area of ​​the gas discharge channel 111 is reduced, as in the first channel 111A, the internal pressure increases at the inlet 112 of the first channel 111A, which has a large cross-sectional area, as the gas velocity decreases, and the internal pressure decreases at the outlet of the first channel 111A, which has a small cross-sectional area, as the gas velocity increases. As a result, the pressure difference between the inlet and outlet of the first channel 111A increases locally, and even if a venting disc 120 of the same area is used, a larger flow rate of gas can be discharged. Therefore, when the internal pressure due to gas generated inside the battery module or battery pack exceeds a reference value, the safety of the battery module and battery pack can be improved by rapidly discharging the gas. In other words, the first channel 111A of the present invention, which has a reduced cross-sectional area, can increase the pressure difference between the inlet and outlet compared to a conventional cylindrical channel, and thus can increase the gas discharge flow rate.

[0061] On the other hand, the so-called choking phenomenon can occur not only in conventional cylindrical flow channels but also in flow channels with decreasing cross-sectional area, such as the first flow channel 111A described above. As mentioned above, in order to discharge a large amount of gas, it is advantageous to have a large pressure difference between the inlet and outlet of the flow channel. However, no matter how large the pressure difference between the inlet and outlet is designed to be, the maximum gas velocity that can be reached at the outlet of a flow channel with decreasing cross-sectional area, such as the first flow channel 111A, is limited to the speed of sound (M=1). In other words, in the subsonic section where the gas velocity is below the speed of sound, the gas is considered to be an incompressible gas, and the gas velocity increases as the cross-sectional area of ​​the gas discharge flow channel 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 velocity at the outlet of the flow channel cannot exceed the speed of sound.

[0062] Therefore, even if the pressure difference between the inlet and outlet is continuously increased, once the outlet flow velocity reaches the speed of sound, a so-called choking phenomenon occurs, in which the flow velocity and flow of the gas at the outlet stagnate.

[0063] In order to eliminate such choking phenomena and further increase the outlet flow velocity, the present invention provides a second flow channel 111B with an increased flow channel cross-sectional area, which is continuous with the first flow channel 111A.

[0064] If the flow velocity at the outlet of the first flow channel 111A reaches the speed of sound, and then the flow channel cross-sectional area increases again as in the second flow channel 111B, the gas will exhibit the behavior of a so-called compressible gas, and unlike the first flow channel, it will undergo supersonic flow where the flow velocity increases with the flow channel cross-sectional area. That is, the flow velocity of the gas that was stagnant at the outlet of the first flow channel 111A will increase further as the cross-sectional area increases in the second flow channel 111B, resulting in flow exceeding the speed of sound. Therefore, according to the present invention, choking is eliminated by continuously forming the first flow channel 111A with a decreasing cross-sectional area and the second flow channel 111B with an increasing cross-sectional area, and finally the flow velocity of the gas at the outlet 113 of the gas discharge channel, i.e., the outlet of the second flow channel 111B, can be further increased to discharge a large amount of gas.

[0065] Furthermore, the present invention has the advantage of being able to mitigate or eliminate the generation of shock waves as in the conventional method.

[0066] Referring to Figure 2, in conventional gas discharge channels, the gas flow velocity at the outlet is not high, so a shock wave is generated near the outlet. A shock wave is an irreversible loss of fluid energy and is accompanied by a rapid pressure increase on the downstream side of the outlet. Thus, when the pressure on the outlet side increases, the pressure difference between the inlet and outlet decreases as a result, hindering gas discharge.

[0067] On the other hand, as shown in Figure 4, in the present invention, which has flow channels with decreasing and increasing cross-sectional areas, the outlet flow velocity is very large, reaching supersonic speeds, and such high-speed flow inertia causes shock waves to be generated far from the outlet. In light of the recent rise in the risk of battery ignition or explosion, it is important to design the flow channels so that such shock waves can be avoided within the region of interest of the flow. The present invention, by providing first and second flow channels 111A and 111B with different cross-sectional areas, can form shock waves far from the outlet 113. Furthermore, since gas flow energy is lost in this process, the intensity of the generated shock waves is also much smaller, as shown by the dotted line in Figure 3, or in some cases, they may dissipate into the atmosphere without generating any shock waves.

[0068] As a result, the present invention does not cause the localized pressure increase at the outlet that occurs in conventional designs.

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

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

[0071] The shape, length, cross-sectional area, and rate of change of cross-sectional area of ​​the first channel 111A and the second channel 111B, which constitute the gas discharge channel 111 of the present invention, can be suitably changed and selected according to the design specifications such as the type, number, and arrangement structure of secondary batteries installed in the battery module and battery pack. In other words, the heat propagation conditions, flame generation conditions, temperature, and pressure that occur in the battery module and pack differ depending on the design specifications of the secondary batteries. Furthermore, the number and arrangement structure of battery modules installed inside the battery pack must also be taken into consideration.

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

[0073] The shape, length, cross-sectional area, and rate of change of the cross-sectional area of ​​this gas discharge channel 111 will be described later.

[0074] On the other hand, the venting disc 120 is installed in the gas discharge channel 111 of the bracket member 110 so as to shield the gas discharge channel. Theoretically, the venting disc 120 can be installed in any part of the path between the first channel 111A and the second channel 111B. In practice, the venting disc 120 can be installed in the most suitable position by considering the pressure, flow velocity, cross-sectional area, channel shape, and ease of installation depending on the location of the gas discharge channel 111.

[0075] The following are examples of preferred installation locations for the typical venting disc 120.

[0076] Firstly, the venting disk 120 can be installed in 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 a cross-sectional area where subsonic behavior changes to supersonic behavior; therefore, when designing the flow path, it is necessary to prioritize determining the cross-sectional area of ​​this throat section T. By installing the venting disc 120 in the throat section T, the area of ​​the venting disc 120 and the range of burst pressure can be designed relatively accurately by taking into account the cross-sectional area in the throat section T. In particular, the flow in the throat section T is more stable than at the inlet and outlet of the gas discharge flow path 111, and since the design is carried out based on such a stable area, there is an advantage in that the design accuracy of the venting disc 120 can be further improved.

[0078] Furthermore, because the pressure deviation is not large before and after the throat section T, there is little possibility of the venting disc 120 being unintentionally damaged before reaching the set pressure.

[0079] Secondly, as shown in Figures 3 and 4, the venting disc 120 may be installed on the inlet 112 side of the gas discharge passage 111. Installing it on the "inlet side" includes both cases, as shown in Figures 3 and 4, where it is installed at the inlet 112 of the first passage 111A that constitutes the gas discharge passage 111, or where it is installed in a portion adjacent to that inlet. Furthermore, if an additional passage preceding the first passage 111A is formed inside the gas venting device 100, the venting disc 120 may be installed in that additional passage (see Figure 7, described later).

[0080] In this case, the venting disk 120 can be effectively protected from external pressure. Furthermore, it is easy to protect critical components such as secondary battery components and module components inside the venting disk 120.

[0081] Furthermore, once the shape of the throat section T is determined, the overall flow rate is not significantly affected by the size of the inlet, making it easier to select the specifications of the venting disc 120 installed at the inlet of the gas discharge passage 111. In other words, once the shape of the throat section T and the passage are determined within a range that allows for the effect of increased flow velocity due to pressure changes at the inlet and outlet, the area of ​​the inlet and the size of the venting disc 120 installed therein can be suitably designed. Therefore, when a venting disc 120 is installed at the inlet 132, there is the advantage of greater design flexibility.

[0082] Thirdly, the venting disc 120 can be installed at the outlet of the gas discharge passage 111, that is, on the side of the outlet 113 of the second passage.

[0083] If the venting disc 120 is installed at the inlet 112 of the flow path or at the throat section T, when the venting disc 120 ruptures, the ruptured fragments may block the flow path or flow into the interior of the module, causing interference. This can lead to a loss of flow stability in the flow path. Installing the venting disc 120 at the outlet 133 of the flow path can reduce this risk and thus contribute to flow stability.

[0084] Since the venting disc 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 only after the gas flow in the gas discharge flow path 111 has fully developed, further improving the flow stability of the flow path and enabling the exhaust gas to be pushed out stably.

[0085] As described above, the venting disc 120 can be installed at the inlet of the first flow path 111A (inlet 112 of the gas discharge flow path), the outlet of the second flow path 111B (outlet 113 of the gas discharge flow path), or at 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 disc 120 can be installed at other locations depending on the design of the flow path.

[0086] However, as mentioned above, there are advantages to installing the venting disc 120 at the inlet, outlet, and throat of the first flow path. Furthermore, in terms of ease of connecting the venting disc 120 to the bracket member 110, it is preferable to install the venting disc 120 on the inlet or outlet side of the gas discharge flow path 111. That is, by placing the venting disc 120 on the inlet and outlet sides of the gas discharge flow path 111, the gas venting device 100 can be easily assembled by, for example, bringing the venting disc 120 into contact with the relative coupling surface of the bracket member 110 and fastening it with a fastening member.

[0087] On the other hand, when connecting the bracket member 110 so that the venting disc 120 is positioned in the throat portion T, it is necessary to separately process the shape of the bracket member 110 or the gas discharge passage 111 in order to provide a place where the venting disc 120 can be connected.

[0088] Therefore, in this invention, in order to simplify the processing of the bracket member 110 while increasing the bonding area between the venting disc 120 and the bracket member 110, the venting disc 120 is installed on the inlet side of the gas discharge passage 111, that is, on the inlet 112 side of the first passage 111A. Furthermore, when the venting disc 120 is installed on the inlet side of the gas discharge passage 111, the venting disc 120 is positioned on the innermost part of the passage and is not exposed to the outside. Therefore, the venting disc 120 can be effectively protected from external pressure, making it easy to protect important internal components. Moreover, as described above, the area of ​​the passage inlet and the size of the venting disc 120 installed therein can be suitably designed within a range that allows for the effect of increased flow velocity due to pressure changes at the inlet and outlet. Therefore, when the venting disc 120 is installed at the inlet, the degree of design freedom is greatly increased.

[0089] The following describes an embodiment in which the venting disc is installed on the inlet side of the gas discharge passage, that is, on the inlet 112 side of the first passage 111A.

[0090] The length, shape, cross-sectional area, and rate of change of cross-sectional area of ​​the first channel 111A and the second channel 111B can be suitably designed considering the design specifications, required safety, and gas flow stability of the secondary battery, battery module, and battery pack.

[0091] Figures 5 to 7 are diagrams showing the flow path shapes of gas venting devices according to various embodiments of the present invention.

[0092] The overall length of the gas discharge channel, or the lengths of the first channel 111A and the second channel 111B, can be determined by considering factors such as the gas discharge pressure, channel cross-sectional area, and the size of the module or pack.

[0093] For example, as shown in Figures 3 and 4, the lengths of the first channel 111A and the second channel 111B can be configured to be the same. In this case, it can be applied when the change in gas flow velocity is relatively simple, and the processing of the bracket member 110 is easy.

[0094] However, as shown in Figures 5 and 6, it is also possible to make the lengths of the first channel 111A and the second channel 111B different. In particular, the length of the first channel 111A, which is the subsonic section, can be shortened, and the length of the second channel 111B, which is the supersonic section, can be lengthened. By shortening the first channel 111A and lengthening the second channel 111B, choking in the throat section T can be quickly resolved, and the gas can be discharged from the outlet with the supersonic flow in the second channel 111B fully developed. This increases the flow inertia of the exhaust gas, and the shock wave generation section can be formed further away from the outlet.

[0095] The first flow path 111A has a flow path cross-sectional area that decreases continuously or sequentially along the gas discharge direction. Considering the case where the flow path cross-sectional area decreases continuously, the cross-sectional profiles on both sides of the first flow path 111A form a tapered shape that approaches each other in the direction of gas discharge. Here, both sides of the flow path refer to the sides that form the inner circumferential wall of the flow path, excluding the inlet and outlet sides that make up the upper and lower parts of the flow path.

[0096] Furthermore, when the cross-sectional area of ​​the second flow path 111B increases continuously along the gas discharge direction, the cross-sectional profiles on both sides of the second flow path form a tapered shape that moves away from each other in the direction of gas discharge.

[0097] In addition to the lengths of the first and second flow channels, the tapered slope of the cross-sectional profiles on both sides can also be determined differently depending on the design objectives. That is, when the flow changes are relatively simple, or when the venting path is short, the tapered slopes of the first and second flow channels can be set to be the same, as shown in Figures 3 and 4. On the other hand, when the flow pattern is complex, and from the viewpoint of preventing choking and shock waves, the tapered slope of the first flow channel 111A can be made larger than the tapered slope of the second flow channel 111B, as shown in Figures 5 and 6.

[0098] On the other hand, the cross-sectional profiles of both sides mentioned above are not limited to straight tapered shapes, but can also include curved tapered shapes. For example, as shown in Figure 5(a), the cross-sectional profiles of both the first and second channels can be straight tapered shapes, or as shown in Figure 5(b), they can both be curved tapered shapes. Alternatively, the cross-sectional profiles of both sides of the first channel 111A and the second channel 111B can be configured in a mixed form of straight and curved shapes. That is, as shown in Figure 6(a), the cross-sectional profile of the first channel 111A can be curved, and the cross-sectional profile of the second channel 111B can be straight. Alternatively, as shown in Figure 6(b), the cross-sectional profiles of the first and second channels can be configured in a straight-curved form.

[0099] Furthermore, even within each of the first channel 111A and the second channel 111B, the cross-sectional profile can be composed of a partially mixed form of straight and curved lines. Importantly, the overall cross-sectional area condition of the channels must be satisfied, decreasing continuously or sequentially (first channel) and increasing (second channel).

[0100] Furthermore, the curvature of the curves can be set to differ according to each flow path, or even within a single flow path, it can be set to differ along the gas discharge direction. For example, the curved tapered flow paths in Figures 5 and 6 have a concave shape that curves 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 with a convex shape that protrudes from the inner wall of the flow path toward the center of the flow path.

[0101] Thus, constructing the cross-sectional profiles on both sides of the flow path with a mixture of straight and curved shapes, or with curves of different curvatures, has the following effects.

[0102] For example, if the cross-sectional profile of a flow path is only straight, it is simple and easy to manufacture, but when connected to other components such as piping, angular parts may occur on the flow path wall, potentially resulting in sections where the flow is unstable. Also, because the rate of decrease in cross-sectional area is constant, if, for example, an unstable gas flows in from the inlet of the flow path, the instability of the gas's flow may not be resolved and is likely to be maintained until the outlet of the flow path. In other words, a flow path with a constant rate of decrease or increase in cross-sectional area has the disadvantage of reducing the degree of freedom to adjust the flow instability within that flow path.

[0103] In contrast, when the reduction rate of the cross-sectional area varies depending on the flow path (for example, a form in which the cross-sectional profiles on both sides are a mixture of straight and curved lines, or a form in which the curvature of the curves differs), there is an advantage in that the aforementioned flow instability can be adjusted or controlled within the flow path. For example, as shown in Figure 6, if the shapes of the first and second flow paths or the profiles on both sides are different, even if the flow in the first flow path 111A is unstable, the flow can be stabilized by suitably 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 different shapes or cross-sectional profiles even within a single flow path, the gas flow within that flow path can be adjusted, thus increasing the design freedom for adjusting flow stability.

[0104] In addition to this, as mentioned above, by adjusting the lengths of the first and second flow channels and their tapered inclines, the design freedom for adjusting flow stability can be further increased.

[0105] On the other hand, the gas discharge channel 111 can be designed with a circular cross-sectional shape perpendicular to the gas discharge direction, as shown in Figure 3. In this case, the three-dimensional shape of the gas discharge channel 111 will be a frustoconical shape. As a result, the cross-sections of the inlet 112 of the first channel 111A, the throat portion T, and the outlet 113 of the second channel 111B will also be circular.

[0106] Here, the first flow path 111A of the gas discharge flow path 111 has a first frustoconical shape 111C in which the cross-sectional profiles on both sides are formed in a straight or curved tapered shape. The second flow path 111B has a second frustoconical shape 111D in which the cross-sectional profiles on both sides are formed in a straight or curved tapered shape.

[0107] Specifically, in Figure 5, the gas discharge channel 111 has a first and second frustoconical outer surface that forms the first and second channels, respectively, and the outer surface of these frustoconical channels has a straight or curved cross-sectional profile.

[0108] Furthermore, the gas discharge channel in Figure 6 has a first frustoconical outer surface forming the first channel 111A with a curved (Figure 6(a)) or straight (Figure 6(b)) cross-sectional profile, and a second frustoconical outer surface forming the second channel 111B with a straight (Figure 6(a)) or curved (Figure 6(b)) cross-sectional profile.

[0109] As described above, by changing or mixing the cross-sectional profiles of the first and second frustoconical shapes 111C and 111D, the flow stability can be adjusted more effectively as described above.

[0110] In Figures 4 to 6, the cross-sectional shape perpendicular to the gas discharge direction is circular, and the first and second flow paths each form a frustoconical shape. However, the cross-sectional shape is not limited to a circle, and can have a rectangular cross-sectional shape as shown in Figure 7.

[0111] In other words, within the range where the conditions for decreasing and increasing the cross-sectional areas of the first and second flow paths are met, it is also possible to adopt a flow path in which the cross-sectional shape perpendicular to the gas discharge flow path is rectangular, as shown in Figure 7. Referring to Figure 7, the first flow path 111A has a first truncated pyramidal shape 111E in which the cross-sectional profiles on both sides are tapered, and the second flow path 111B has a second truncated pyramidal shape 111F in which the cross-sectional profiles on both sides are tapered. In the gas discharge flow path of Figure 7, the first truncated pyramidal shape 111E and the second truncated pyramidal shape 111F have a truncated pyramidal shape in which the cross-sectional profiles on both sides of the flow path are trapezoidal. A gas discharge flow path having such a rectangular cross-sectional shape can also be suitably adopted for design purposes or for adjusting flow stability.

[0112] Thus, a channel having a rectangular (quadrilateral) cross-sectional shape perpendicular to the gas discharge direction, that is, a channel whose three-dimensional shape forms a truncated pyramidal shape, can be applied not only to Figure 7 but also to channels having cross-sectional profiles on both sides of the shape as shown in Figures 5 and 6.

[0113] As shown in the cross-sectional view in Figure 7(a) and the perspective view in Figure 7(b), a linear channel 115 can be additionally formed inside the gas discharge channel 111, i.e., inside the first channel 111A, as needed. When a linear channel 115 is added in this way, the flow inside the gas venting device 100 can be stably guided to the first channel 111A side. Furthermore, when a linear channel 115 is included inside the bracket member 110, it is easy to introduce a tool for machining the channel inside the bracket member 110, which may be advantageous in terms of ease of machining.

[0114] The linear flow path 115 described above has a rectangular cross-sectional shape perpendicular to the gas discharge direction, but a circular flow path, that is, a flow path with a cylindrical three-dimensional shape, is also possible.

[0115] In this case, the venting disk 120 can be installed on the inlet side of the linear flow path 115. Such a linear flow path 115 can be applied not only to the truncated pyramidal flow path as shown in Figure 7, but also to the inlet side of the truncated cone-shaped flow path as shown in Figures 4 to 6.

[0116] Figure 8 is a drawing showing a gas venting device according to another embodiment of the present invention.

[0117] Figure 8(a) is a schematic cross-sectional view, and Figure 8(b) is a perspective view of the discharge guide 130, which is a component of the gas venting device described above.

[0118] In Figures 3 to 7 above, the through-hole of the bracket member 110 is formed as a gas discharge channel 111 including a first channel 111A and a second channel 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, the bracket member 110 itself must be replaced with one of a different flow path shapes, which is inconvenient.

[0120] In the embodiment shown in Figure 8, the objective of the present invention is achieved by inserting a discharge guide 130, through which a gas discharge channel 131 is formed, into the through-hole of the bracket member 110. That is, in this embodiment, a gas discharge channel consisting of the first channel and the second channel is formed through the discharge guide 130, and this discharge guide 130 is connected to the through-hole of the bracket member 110. At the same time, the venting disc 120 is connected to the bracket member 110 and the discharge guide 130 at the inlet 132 side of the gas discharge channel 131 of the discharge guide 130. As shown in Figure 8, the gas discharge channel 131 of the discharge guide 130 is formed in a manner in which a first channel with a first frustoconical shape 131C and a second channel with a second frustoconical shape 131D are continuously formed, with the directions of the tapered cross-sectional profiles on both sides being opposite to each other.

[0121] The discharge guide 130 described above has a detachable or replaceable structure. Thus, in this embodiment, by using a separate discharge guide 130 equipped with a gas discharge passage 131 on the bracket member 110, gas discharge is made smoother, parts can be easily replaced, and the shape of the passage can be easily changed. In this case, the description of the length, inclination, and shape of the gas discharge passage 111 described with reference to Figures 4 to 7 above can also be applied to the gas discharge passage 131 of the discharge guide 130.

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

[0123] Referring to Figure 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 Figure 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 also has a plate-like projection that protrudes along its outer circumferential portion in a shape similar to the outer circumferential portion of the venting disc 120. The fastening portion 135 has a fastening hole (not shown) formed in it for bolt fastening to the bracket member 110. The fastening hole formed in the fastening portion 135 is formed in the same position as the fastening hole formed in the bracket member 110 and is fixed by bolt insertion.

[0124] On the other hand, the position in which the fastening portion 135 is formed can be suitably designed. For example, as shown in Figure 9(a), the fastening portion 135 may be formed so as to be located between the bracket member 110 and the venting disc 120. Alternatively, the fastening portion may be formed so as to be in contact with the other surface of the bracket member 110 that is in contact with the venting disc 120.

[0125] In another example, the bracket member 110 and the discharge guide 130 can be connected by screw fastening. In this case, as shown in Figure 9(b), the inner wall of the through-hole of the bracket member 110 and the outer surface of the discharge guide 130 can be formed to correspond to screw threads 116 and 136 for screw fastening. This allows the bracket member 110 and the discharge guide 130 to be fastened in the same way as nuts and bolts are fastened. In this way, when the discharge guide 130 is fastened to the bracket member 110 by screw fastening, the structure of the parts and the fastening method are simplified, and the discharge guide 130 can 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 to the venting disc 120.

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

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

[0128] The cross-sectional areas of the outlets 113 and 133 (outlets of the second flow path) of the gas discharge passages 111 and 131 described above may be the same as or different from the inlet cross-sectional areas described above.

[0129] On the other hand, patterns (not shown) may be formed on the inner walls of the gas discharge channels 111 and 131 to assist in gas discharge. For example, the patterns may be threads, embossing, or protrusions having a linear pattern parallel to the gas discharge direction. Specifically, the patterns may be in the form of threaded protrusions that enclose the inside of the channel along the inner wall of the channel. Such patterns can promote gas discharge.

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

[0131] The venting disc 120 includes an outer disk portion 121 fastened to the bracket member 110, and an inner disk portion 122 formed integrally with the outer disk portion 121, which shields the through hole and ruptures when a predetermined pressure is applied.

[0132] The outer periphery 121 of the disc is the part for fixing the bracket member 110 and the venting disc 120. The outer periphery 121 of the disc may be provided with bolt through holes 123 along the circumferential direction, and the bracket member 110 and the outer periphery 121 of the disc can be integrally joined by a bolt fastening method or the like.

[0133] The inner circumference 122 of the disc may be made of a metal or plastic material that can rupture when a predetermined pressure is applied. For example, the inner circumference 122 of the disc may be made of a thin metal such as copper, aluminum, or stainless steel, or a plastic material. The material of the inner circumference 122 of the disc can be suitably selected according to the pressure conditions at the time of rupture.

[0134] Under normal conditions, the inner circumference 122 of the disc blocks the through-holes formed in the bracket member 110, 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 will rise, and this pressure will act as a force that causes the inner circumference 122 of the disc to burst. At this time, since the pressure inside the battery module or battery pack is higher than the external atmospheric pressure, the internal gas may be discharged to the outside of the battery module or battery pack due to negative pressure.

[0135] A notch 124 is formed in the inner circumference 122 of the disk so as to rupture when a predetermined pressure is applied. Such a 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 can be designed to be a cross shape, a circular square, a U shape, an ellipse, an arc shape, etc., and the cross-section of the notch 124 can be a trapezoid, a V shape, a square, an arc shape, etc. The shape of the notch 124 formed in the inner circumference 122 of the disk is not necessarily limited to these and can have a variety of shapes. For example, the shape of the notch 124 may be X-shaped as shown in Figure 11. In this case, even if the inner circumference 122 of the disk ruptures, the ruptured piece of the inner circumference 122 of the disk may not completely fall off but may remain attached to the outer circumference 121 of the disk. If the ruptured piece of the inner circumference of the disk completely separates from the venting disk and falls off, it may be difficult to remove and may damage other parts.

[0136] Furthermore, a disc pad (not shown) may be interposed between the bracket member 110 and the venting disc 120. Such a disc pad may be provided in an annular or ring shape, corresponding to the outer circumference 121 of the disc. The disc pad is intended to improve airtightness between the bracket member 110 and the venting disc 120 and to prevent damage to the outer circumference 121 of the disc. For example, the disc pad may be made of an elastic rubber material or the like.

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

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

[0139] Referring to Figure 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 the gas venting device 100 described above is fastened to one side of the module frame 210.

[0140] Specifically, the above-mentioned secondary battery has an electrode assembly in which a positive electrode, a negative electrode, and a separator membrane are alternately stacked, and this assembly is mounted together with an electrolyte inside a cell case. Since the configuration of such a secondary battery is obvious to a person skilled in the art to which the present invention belongs, a more detailed explanation will be omitted.

[0141] In one example, the gas venting device 100 may be fastened such that the bracket member 110 is in contact with the outer surface of the module frame 210, as shown in Figure 12(a), or such that the bracket member 110 is in contact with the inner surface of the module frame 210, as shown in Figure 12(b). In the specification of the present invention, the inner surface of the module frame 210 means the surface of the module frame 210 facing the internal space on which the secondary battery is mounted, and the outer surface means the surface of the module frame 210 that is exposed to the outside. The module frame 210 has fastening holes formed in the 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 disc 120, so that the bracket member 110, the venting disc 120, and the discharge guide 130 can be fixed to the module frame 210 by a single bolt fastening. Furthermore, the module frame 210 is formed with holes of a size corresponding to the through holes formed in the bracket member 110 or the inlet of the gas discharge channel 131 formed in the discharge guide 130, thereby allowing gas generated within the module to be discharged.

[0142] On the other hand, the battery module 200 may further include a sealing member (not shown) that seals the space between the module frame 210 and the outer periphery of the gas venting device 100. The sealing member may be a rubber ring or 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 Figure 12, when the venting disc 120 is installed on the inlet 112, 132 side of the gas discharge passages 111, 131 of the gas venting device 100 or discharge guide, the venting disc 120 shields the passage leading from the innermost part of the passage to the battery module. Therefore, by blocking external contamination, the venting disc 120 can prevent damage to components inside the module frame 210 of the battery module 200.

[0144] Furthermore, the present invention provides a battery pack that includes the gas venting device described above.

[0145] The battery pack according to the present invention includes at least one battery module having a plurality of secondary batteries, and a battery pack case on which the battery module is mounted, wherein a gas venting device as described above can 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 connection between the module frame and the gas venting device described above.

[0147] In other words, the gas venting device described above can have the bracket member 110 connected to the inner or outer surface of the battery pack case.

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

[0149] Based on the above, the gas venting device according to the present invention, the battery module and battery pack equipped therewith, will rupture the venting disc when the internal pressure exceeds a standard value while the interior is sealed, and the gas inside the battery pack will be discharged to the outside.

[0150] This invention employs a continuous gas discharge channel in which the cross-sectional area of ​​the gas discharge channel decreases continuously or sequentially in the gas discharge direction and then increases again. This overcomes the conventional limitation where the outlet flow velocity remains subsonic and choking occurs, and makes it possible to discharge gas at a larger flow rate by making the outlet flow velocity of the gas discharge channel supersonic or higher.

[0151] Furthermore, as mentioned above, the gas flow stability at the outlet is greatly improved, which can reduce or prevent the generation of shock waves.

[0152] In particular, in this invention, by installing the venting disc on the inlet side of the gas discharge passage, the venting disc and internal components can be effectively protected from external pressure. Furthermore, the area of ​​the passage inlet and the size of the venting disc can be suitably designed within a range that allows for the effect of increased flow velocity in response to pressure changes at the inlet and outlet.

[0153] The above description is merely illustrative of the technical concept of the present invention, and a person with ordinary skill in the art to which the present invention pertains could make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the drawings disclosed herein are for illustrative purposes only, not to 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 in accordance with the following claims, and all technical concepts within an equivalent scope should be interpreted as being included within the scope of the rights of the present invention.

[0154] In this specification, terms indicating direction such as up, down, left, right, front, and back are used, but these terms are merely for convenience of explanation, and it is self-evident that they can 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 component 111: Gas exhaust channel 111A: First channel 111B: Second channel 111C: First truncated cone shape 111D: Second truncated cone shape 111E: 1st truncated pyramid shape 111F: 2nd truncated pyramid shape 112:Entrance 113:Exit T: Throat area 115: Straight channel 116: Screw thread 120: Venting Disc 121: Outer edge of the disk 122: Inner circumference of the disk 123: Bolt through hole 124: Notch 130: Disposal Guide 131: Gas exhaust channel 131A: First channel 131B: Second channel 131C: First truncated cone shape 131D: Second truncated cone shape 132:Entrance 133:Exit 135: Fastening part 136: Screw thread 140: Fastening member 200: Battery Module 210: Module Frame

Claims

1. A hollow bracket member having a through hole, A discharge guide is inserted into the aforementioned through hole, and a gas discharge channel is formed through it. A venting disc is coupled to the bracket member to block the gas discharge passage and is configured to rupture when a predetermined pressure is applied, A gas venting device comprising, The aforementioned gas discharge channel is A first flow path in which the flow path cross-sectional area decreases continuously or sequentially along the gas discharge direction, A second flow path is formed continuously with the first flow path, and the flow path cross-sectional area increases continuously or sequentially along the gas discharge direction, Includes, The venting disc is installed on the inlet side of the gas discharge passage, The cross-sectional profiles on both sides of the first flow path are formed in a tapered shape that approaches each other in the direction of gas discharge. The cross-sectional profiles on both sides of the second flow path are formed in a tapered shape that moves away from each other in the direction of gas discharge. The venting disc is coupled to the bracket member and the discharge guide at the inlet side of the gas discharge passage of the discharge guide, thereby shielding the gas discharge passage. A gas venting device wherein a fastening portion for fastening the discharge guide to the bracket member is formed on the outer circumferential surface of the discharge guide, and the bracket member and the discharge guide are connected by a screw fastening method.

2. The gas venting apparatus according to claim 1, wherein the first flow path and the second flow path are the same or different in length.

3. The gas venting apparatus according to claim 1, wherein the tapered inclination of the first flow path and the tapered inclination of the second flow path are the same or different.

4. The gas venting device according to claim 1, wherein the cross-sectional profiles of both sides of the first flow path and the second flow path are formed in a straight or curved tapered shape.

5. The first channel has a first frustoconical shape in which the cross-sectional profiles on both sides are formed in a straight or curved tapered shape. The gas venting device according to claim 4, wherein the second flow path has a second frustoconical shape in which the cross-sectional profiles on both sides are formed in a straight or curved tapered shape.

6. The first channel has a first truncated pyramidal shape in which the cross-sectional profiles on both sides are formed in a tapered shape. The gas venting device according to claim 1, wherein the second flow path has a second truncated pyramidal shape in which the cross-sectional profiles on both sides are tapered.

7. The gas venting device according to claim 6, wherein the first truncated pyramidal shape and the second truncated pyramidal shape are truncated pyramidal shapes with a trapezoidal cross-sectional profile.

8. The gas venting apparatus according to claim 1, wherein a flow channel having a straight cross-sectional profile on both sides is connected to the inlet side of the first flow channel.

9. The aforementioned ventilation disk is The outer peripheral portion of the disk is coupled to the bracket member, The inner circumferential portion of the disk is formed integrally with the outer circumferential portion of the disk, which shields the gas discharge passage and ruptures when a predetermined pressure is applied, Includes, The gas venting device according to claim 1, wherein a notch is formed in the inner circumference of the disk so as to burst when the predetermined pressure is applied.

10. Multiple rechargeable batteries, The module frame on which the secondary battery is mounted includes, A battery module in which a gas venting device according to any one of claims 1 to 9 is coupled to one side of the module frame.

11. The battery module according to claim 10, further comprising a sealing member for sealing the space between the module frame and the outer periphery of the gas venting device.

12. A battery module comprising at least one secondary battery, The battery pack case on which the aforementioned battery module is mounted includes, A battery pack in which a gas venting device according to any one of claims 1 to 9 is coupled to one side of the battery pack case.

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