Battery pack, power storage device including the same, and automobile

Abstract

To provide a battery pack capable of preventing or delaying propagation of a thermal runaway by smoothly discharging a venting gas and simultaneously preventing a backflow thereof, and provide a power storage device and an automobile including the same.SOLUTION: A battery pack for accommodating a battery cell or a battery module is a battery pack capable of preventing a venting gas generated in the battery pack from flowing back into the battery pack by a backflow prevention mechanism capable of opening and closing a venting inlet formed in a side frame in one direction while efficiently discharging the venting gas to the outside of the battery pack through the venting inlet.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a battery pack containing battery cells or battery modules.

[0002] More particularly, the present invention relates to a battery pack that can efficiently discharge venting gas generated within the battery pack to the outside of the battery pack while preventing the venting gas from flowing back into the battery pack.

[0003] The present invention also relates to a power storage device and a vehicle including the battery pack.

[0004] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0083104, dated July 6, 2022, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference. [Background technology]

[0005] A battery pack used in an electric vehicle or the like 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 can be repeatedly charged and discharged through electrochemical reactions between components including positive and negative electrode current collectors, separators, active materials, and electrolytes.

[0006] A secondary battery may generate gas from inside during repeated charging and discharging, which is called venting gas. For example, when an overcurrent flows, the temperature inside the secondary battery rises rapidly. This rapid temperature rise can cause a decomposition reaction of the electrolyte, generating gas. If gas is generated from a secondary battery inside 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 through the battery pack's cooling ducts. Therefore, battery packs are equipped with a venting mechanism, such as a gas venting channel, that releases internal gas to the outside and reduces internal pressure.

[0007] For example, when thermal runaway occurs in one of the battery modules installed in the battery pack, generating venting gas, the venting gas can be discharged through the venting mechanism.

[0008] However, the venting gas may not be discharged to the outside but may instead flow back into the battery pack. For example, if a rupturable sheet installed at the venting outlet of the gas venting channel does not rupture even though it reaches a set pressure, causing the pressure in the gas venting channel to increase, the venting gas may instead flow back into the battery pack. Alternatively, if thermal runaway occurs in multiple battery modules, venting gas may flow back through the gas venting channel from a battery module with a higher thermal runaway pressure to a battery module with a lower pressure.

[0009] In this case, the gas venting channel for discharging the venting gas becomes a path for transmitting thermal runaway to other modules, and there is a risk of thermal runaway occurring simultaneously in multiple modules. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Korean Patent Publication No. 10-2018-0039986 Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention is intended to solve the above problems and to provide a battery pack that can prevent or delay the propagation of thermal runaway by smoothly discharging venting gas while preventing its backflow, and a power storage device and a vehicle including the same. [Means for solving the problem]

[0012] In order to solve the above problems, a battery pack according to one embodiment of the present invention is a battery pack accommodating a plurality of battery cells or a plurality of battery modules, the battery pack including: a pack housing including a side frame having a gas venting channel formed therein and a venting inlet communicating with the gas venting channel formed in at least one location on an inner wall facing the battery cells or battery modules; a venting plate having a plate cutout surrounded by a graphic-shaped cutting line with one side edge open and a plate main body portion surrounding the plate cutout, the venting plate covering the venting inlet and coupled to the inner wall of the side frame; and a restricting member coupled to the venting plate on an inner side of the venting plate opposite the venting inlet, covering the plate cutout, wherein the plate cutout is movable toward the inside of the venting inlet using one side edge connected to the plate main body portion as a support axis, but movement toward the opposite side of the venting inlet is blocked by the restricting member.

[0013] The gas venting channel may be formed in the side frame along an edge of the battery cell or battery module.

[0014] The venting inlets may be formed on inner walls of side frames on both sides of the battery cell or battery module, respectively, and the venting plate and the restricting member may be installed on the venting inlets, respectively.

[0015] The venting inlet may be formed on an inner wall of a side frame facing a terminal portion of the battery cell or a terminal portion of the battery module, and the venting plate and the restricting member may be installed on the venting inlet.

[0016] The venting inlet may be formed to a predetermined length along the longitudinal direction of the side frame, and the plate cutout may be formed to a size that allows it to be inserted into the venting inlet.

[0017] With the plate incision positioned above the venting inlet, the plate body can be joined to the inner wall of the side frame around the venting inlet.

[0018] The restricting member may be a blocking bracket having a vent hole at a portion facing the plate cutout and a blocking frame for blocking movement of the plate cutout.

[0019] Also, the edge of the blocking bracket and the plate body can be fastened together to the inner wall of the side frame around the venting inlet by fastening members.

[0020] Meanwhile, a venting outlet communicating with the gas venting channel may be formed in the outer wall of the side frame.

[0021] In this case, the venting outlet may be formed in an outer wall of the side frame disposed perpendicular to the side frame in which the venting inlet is formed.

[0022] The battery pack of one embodiment may include a venting cap that covers the venting outlet and extends to the outside.

[0023] In this case, the battery pack may further include a gas sealing member installed in the venting outlet or the venting cap, and deformed at or above a predetermined pressure and / or a predetermined temperature to open the venting outlet to the outside.

[0024] The plate incisions may be formed in pairs in the plate body.

[0025] A plurality of the gas venting channels may be formed at predetermined intervals in the height direction of the side frame, and the venting plate and the regulating member may be installed on each venting inlet of the inner wall of the side frame that communicates with each of the gas venting channels.

[0026] The venting plate may include one plate main body and a plurality of plate cutouts formed at predetermined intervals in the height direction to correspond to the gas venting channels, and with each plate cutout positioned above each venting inlet, the plate main body may be coupled to the side frame while covering the entire periphery of each venting inlet on the inner wall of the side frame, and one restricting member may be coupled to the venting plate while covering the plate cutout.

[0027] Meanwhile, one embodiment of the present invention provides a power storage device including the above-described battery pack.

[0028] An embodiment of the present invention also provides a vehicle including the above-described battery pack. [Effects of the Invention]

[0029] According to the various embodiments described above, the present invention can efficiently exhaust venting gas to the outside of the battery pack.

[0030] Furthermore, according to the various embodiments described above, the venting gas in the gas venting channel can be prevented from flowing back into the battery pack, thereby preventing thermal runaway from spreading to adjacent battery modules. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a perspective view showing a battery pack according to an embodiment of the present invention; [Figure 2] FIG. 2 is an assembled perspective view of the backflow prevention mechanism according to the present invention. [Figure 3] FIG. 2 is an exploded perspective view of the backflow prevention mechanism according to the present invention. [Figure 4] 3 is a schematic diagram showing the operation of the venting plate of FIG. 2. [Figure 5] 3 is a schematic diagram showing an operating state of the backflow prevention mechanism of the present invention. FIG. [Figure 6] FIG. 2 is a schematic diagram showing a path through which venting gas is discharged from the battery pack of FIG. 1. [Figure 7] 1 is a view showing an example of a venting outlet provided in a battery pack of the present invention. [Figure 8] FIG. 10 is a schematic diagram showing a battery pack according to another embodiment of the present invention. [Figure 9] 9 is a schematic diagram showing the operation of the venting plate of FIG. 8. [Figure 10] FIG. 10 is a schematic diagram showing a battery pack according to another embodiment of the present invention. [Figure 11] 11A and 11B are schematic diagrams illustrating the operation of the venting plate of FIG. 10. [Figure 12] FIG. 10 is a schematic diagram showing a battery pack according to another embodiment of the present invention. [Figure 13] 13 is a schematic diagram showing the operation of the venting plate of FIG. 12. FIG. [Figure 14] FIG. 10 is a schematic diagram showing a battery pack according to another embodiment of the present invention. [Figure 15] FIG. 10 is a schematic diagram showing a battery pack according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] The present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. The embodiments described herein are shown by way of example to facilitate understanding of the invention, and it should be understood that the present invention can be implemented in various forms different from the embodiments described herein. Furthermore, to facilitate understanding of the invention, the accompanying drawings are not drawn to scale, and the dimensions of some components may be exaggerated.

[0033] The present invention will be described in detail below.

[0034] A battery pack according to an embodiment of the present invention is a battery pack accommodating a plurality of battery cells or a plurality of battery modules, the battery pack including: a pack housing including side frames having a gas venting channel formed therein and a venting inlet communicating with the gas venting channel formed in at least one location of an inner wall facing the battery cells or battery modules; a venting plate having a plate cutout surrounded by a graphic cutting line with one side edge open and a plate main body portion surrounding the plate cutout, the venting plate covering the venting inlet and coupled to the inner wall of the side frame; and a restricting member coupled to the venting plate on an inner side of the venting plate opposite the venting inlet and covering the plate cutout, wherein the plate cutout is movable toward the inside of the venting inlet using one side edge connected to the plate main body portion as a support axis, but movement in a direction opposite the venting inlet is blocked by the restricting member.

[0035] Meanwhile, one embodiment of the present invention provides a power storage device including the above-described battery pack.

[0036] An embodiment of the present invention also provides a vehicle including the above-described battery pack.

[0037] (First embodiment) FIG. 1 is a perspective view showing a battery pack according to one embodiment of the present invention, FIGS. 2 and 3 are an assembled perspective view and an exploded perspective view of a backflow prevention mechanism according to the present invention, and FIG. 4 is a schematic diagram showing the operation of the venting plate of FIG. 2.

[0038] 1 to 4, a battery pack 100 of the present invention includes a plurality of battery cell stacks 10, a pack housing 110, a venting plate 120, and a restricting member .

[0039] The battery cell 11 is a secondary battery, and may be a pouch-type secondary battery, a prismatic secondary battery, or a cylindrical secondary battery. Hereinafter, in this embodiment, the battery cell will be described as being limited to a pouch-type secondary battery.

[0040] A plurality of the battery cells 11 are provided in the battery pack 100. The plurality of battery cells may be stacked and disposed so as to be electrically connected to each other. The battery pack 100 of the present invention may contain a plurality of battery cell stacks 10 as shown in FIG. 1, or may contain a plurality of battery modules as in other embodiments described below. Battery packs containing battery modules are the conventional battery packs that have been commonly used. However, so-called cell-to-pack battery packs have recently been developed that simplify the battery pack structure and construct the battery pack directly from battery cells without modules. The battery pack 100 of FIG. 1 also has a cell-to-pack structure and contains a plurality of battery cells 11 without modules. To obtain the electrical capacity of the battery pack unit, a larger number of battery cells than those provided in a module may be stacked and disposed in the battery pack 100. Alternatively, large-capacity battery cells larger than ordinary battery cells may be disposed in the battery pack 100.

[0041] The pack housing 110 forms a space for accommodating the battery cell stack 10 and an electrical component assembly (not shown) therein, and is a structure provided with a predetermined bracket so that the pack housing 110 can be coupled to the body of a vehicle.

[0042] Specifically, the pack housing 110 may include a base plate 111 on which the battery cells are mounted, side frames 112 formed along the edges of the base plate 111, and a pack cover (not shown) covering the top of the battery cells and coupled to the side frames 112. As will be described later, the structure of the pack housing 110 that accommodates the battery modules is different from that of the present embodiment.

[0043] Specifically, the side frames 112 are composed of a front frame 112a, a rear frame 112b, a right frame 112c, and a left frame 112d, which are vertically coupled along the periphery of the base plate 111 to form walls. In a particular pack housing 110, only the right frame 112c and the left frame 112d may be referred to as side frames 112. However, in the present invention, because a gas venting channel and a backflow prevention mechanism B (described later) may be installed in all frames forming the walls of the pack housing 110, the front frame 112a and the rear frame 112b may also be defined as side frames 112.

[0044] The base plate 111 and frame may be welded and bolted together to assemble the pack housing 110.

[0045] As shown in FIGS. 2 and 3, the side frame 112 is a hollow frame having a gas venting channel H formed therein. For example, the side frame 112 may be manufactured by extruding aluminum to form an empty space therein. By configuring the frame to be hollow in this manner, the weight of the pack housing 110 may be reduced. Furthermore, by forming a rib-shaped partition wall in the empty space, the mechanical rigidity of the frame may be maintained at a reliable level. In this case, as will be described later, the partition wall may form a plurality of gas venting channels H inside the frame, thereby improving the gas discharge effect.

[0046] The side frame 112 has a venting inlet I at least at one location on the inner wall facing the battery cell, through which venting gas flows in. The venting inlet I is connected to a gas venting channel H inside the side frame 112, and venting gas generated inside the pack can be discharged to the outside through the venting inlet I and the gas venting channel H.

[0047] The side frames 112 are disposed along the edges of the battery cells, and the gas venting channels H may also be formed in the side frames 112 along the edges of the battery cells. Therefore, when venting gas is generated in some battery cells, the venting gas introduced into the venting inlet I is discharged through the gas venting channels H, which have a long path along the side frames 112. In this process, incompletely combusted venting gas can be completely combusted, or the temperature and pressure of the high-temperature, high-pressure venting gas can be reduced. In other words, by lengthening the venting path, the unstable state of the venting gas can be stabilized, thereby reducing the risk of an accident caused by venting gas.

[0048] The venting inlet I of the present invention is preferably formed to a predetermined length along the longitudinal direction of the side frame 112 so that a part of the venting plate 120 described below can be inserted therein.

[0049] The present invention is characterized by including a predetermined backflow prevention mechanism B to prevent high-temperature venting gas from propagating to adjacent battery cells.

[0050] 2 and 3, the backflow prevention mechanism B is installed on the venting inlet I. Because the gas venting channel H is narrow and formed inside the side frame 112, it is very difficult to install a backflow prevention mechanism in the passage of the gas venting channel H. For example, it is difficult to install a backflow prevention mechanism such as a check valve in the passage of the gas venting channel. Furthermore, installing a backflow prevention mechanism in the passage requires the components included in the check valve to be designed smaller and more precisely. In the present invention, the backflow prevention mechanism B is installed on the side of the venting inlet I formed on the inner wall of the side frame 112, which is exposed to the outside, so the backflow prevention mechanism B can be easily attached to the pack housing 110. Furthermore, because the backflow prevention mechanism B is configured to block the venting inlet I itself, the components of the backflow prevention mechanism B can be made relatively large, as described below, facilitating manufacturing. In particular, when a check valve or the like is installed in the passage of the gas venting channel, it is unclear whether it is possible to prevent backflow of venting gas in the passage portion after the check valve. However, if backflow occurs in the gas venting channel portion before the check valve, for example, between the battery cell and the check valve, there is a problem in that it is impossible to prevent backflow of venting gas.

[0051] The present invention has the advantage that a backflow prevention mechanism B is installed at the venting inlet I itself, thereby blocking the venting gas from propagating to other battery cells or battery modules at the source.

[0052] 2 and 3, the backflow prevention mechanism B of the present invention includes a venting plate 120 and a restricting member 130. As shown in FIG.

[0053] The venting plate 120 includes a plate cutout 121 surrounded by a cutting line C having a shape with one side open, and a plate body 122 surrounding the plate cutout 121 .

[0054] One side 121a of the plate cutout 121 extends from the plate main body 122, and no cutting line C is formed thereon. The other side of the plate cutout 121 is separated from the plate main body 122 by the cutting line C. Therefore, as shown in FIG. 4, the plate cutout 121, which is the plate portion surrounded by the cutting line C, can move toward or away from the vent inlet I with the one side 121a as a support axis. For example, due to the pressure of the venting gas, the plate cutout 121 can perform a cantilever motion, moving toward the vent inlet I with the support axis as its center. More specifically, one end of the plate cutout 121 can elastically deform to bend toward or away from the vent inlet I with the support axis as its center. In FIGS. 2 to 4, the cutting line C is formed in a U-shape, and the plate cutout 121 has a generally rectangular shape with one side 121a open. However, the shapes of the cutting line C and the plate cutout 121 are not limited thereto. As long as one side is connected to the plate main body 122, the cutting line C and the plate cutout 121 may be triangular with one side open, or circular, elliptical, or other polygonal with one side open. However, since the plate cutout 121 moves into the vent inlet I to open it, its size may be determined taking into account the size of the vent inlet I. For example, the vent inlet I may be formed to a predetermined length along the longitudinal direction of the side frame 112, as shown in FIG. 2. That is, the vent inlet I may be formed long in an elliptical or rectangular shape to efficiently discharge vent gas. Accordingly, the plate cutout 121 may also be formed long enough to correspond to the length of the vent inlet I and large enough to be inserted into the vent inlet I.

[0055] The venting inlet I is open toward the inside of the battery pack 100 on the inner wall of the side frame 112. In addition, since the venting inlet I is in communication with the gas venting channel H, a short communication space corresponding to the thickness of the inner wall of the side frame 112 is formed between the venting inlet I and the gas venting channel H. The plate cutout 121 can move into the communication space through the venting inlet I with one side serving as a support axis. That is, the communication space is a surplus space in which the plate cutout 121 can move between the venting inlet I and the gas venting channel H.

[0056] The venting plate 120 may be made of a material that allows elastic deformation of the plate cutout 121 around one side, but must be made of a material that can withstand high-temperature and high-pressure venting gas generated within the battery pack 100. For example, the venting plate 120 may be made of a metal material such as steel or stainless steel.

[0057] As shown in FIG. 3, the venting plate 120 covers the venting inlet I and is coupled to the inner wall of the side frame 112 .

[0058] Specifically, with the plate cutout 121 positioned over the venting inlet I, the plate main body 122 is coupled to the inner wall of the side frame 112 around the venting inlet I. To couple the venting plate 120, as shown in FIG. 2 , predetermined fastening holes h1 and h2 are formed in the inner wall of the side frame 112 and the edge of the plate main body 122, and the venting plate 120 can be coupled to the venting inlet of the side frame 112 using fastening members. Alternatively, the venting plate 120 can be coupled to the side frame 112 by other methods such as welding, but the coupling method is not limited thereto. The plate main body 122 around the plate cutout 121 plays a role in supporting the plate cutout 121 when it moves, so the plate main body 122 needs to be firmly coupled to the inner wall of the side frame 112.

[0059] 2, a restricting member 130 for restricting movement of the plate cutout 121 is located on the inner side of the venting plate 120, i.e., on the side of the venting plate 120 opposite to the venting inlet I. The restricting member 130 is coupled to the venting plate 120 to cover at least the plate cutout 121.

[0060] The restricting member 130 may be a bracket-shaped member that blocks the movement of the plate cutout 121. FIG. 2 illustrates the restricting member 130 as a rectangular-framed blocking bracket that corresponds to the shape of the venting inlet 1 and the plate cutout 121. The blocking bracket must block only the movement of the plate cutout 121 while allowing the flow of venting gas. Therefore, a venting hole 132, which is a passage for venting gas, is provided in the portion of the blocking bracket facing the plate cutout 121. Furthermore, a blocking frame 133 for blocking the movement of the plate cutout 121 is installed in the approximate center of the blocking bracket, which is the opposing portion. That is, the blocking bracket of this embodiment restricts the movement of the venting plate 120 by the rectangular edge frame 131 and the blocking frame 133 near the venting hole 132.

[0061] The size and shape of the blocking bracket may be suitably determined in consideration of the joining area with the venting plate 120, ease of blocking the plate cutout 121, etc. Also, the size, position, and number of the venting holes 132 of the blocking bracket, the shape and position of the blocking frame 133, and the size and shape of the edge frame 131 may be suitably changed in consideration of ease of blocking the plate cutout 121, etc.

[0062] The material of the blocking bracket may be metal, plastic resin, or other material that can withstand high-temperature and high-pressure venting gas. As shown in FIG. 3, an edge frame 131 of the blocking bracket may be coupled to the venting plate main body 122. In this case, the edge frame 131 of the blocking bracket and the plate main body 122 may be fastened together to the inner wall of the side frame 112 around the venting inlet I by fastening members. Therefore, the installation of the backflow prevention mechanism B can be easily performed with a single fastening operation. In addition, because the edge frame 131 of the blocking bracket is firmly fastened together with the plate main body 122 to the inner wall of the side frame 112, the plate cutout 121 can be stably elastically deformed while being supported by the fastening members.

[0063] A battery cell or a battery module is located inside the isolation bracket, and when abnormally high heat is generated, venting gas is generated from the cell or the module and can be discharged to the isolation bracket side.

[0064] The backflow prevention mechanism B, including the venting plate 120 and the restricting member 130 (blocking bracket), may be installed at least at one location on an inner wall facing a battery cell or a battery module. For efficient gas discharge, the venting inlets I may be formed at least on the inner walls of the side frames 112 on both sides of the battery cell or battery module. In this case, the venting plate 120 and the restricting member 130 may be installed on the venting inlets (see FIG. 1 ). When the venting inlets I are formed on both side frames 112, venting gas generated on both sides of the battery pack 100 can be simultaneously discharged, thereby enabling rapid discharge of the venting gas. Furthermore, distributing the venting gas by overloading it on one side of the venting inlet I can be prevented, thereby maintaining a balanced internal pressure within the battery pack 100. When the venting inlets I are formed on both side frames 112, the venting plate 120 and the restricting member 130 are installed on each venting inlet I on both sides to prevent gas backflow.

[0065] Furthermore, since the terminal portion 12 of the battery cell or the terminal portion of the battery module is prone to generating high-temperature venting gas, it is preferable to install the venting inlet I and the backflow prevention mechanism B on the inner wall of the side frame 112 facing them (see Figure 1).

[0066] FIG. 5 is a schematic diagram showing the operation of the backflow prevention mechanism B of the present invention, and FIG. 6 is a schematic diagram showing the path along which the venting gas is discharged according to this embodiment.

[0067] 1, a venting outlet O communicating with the gas venting channel H is formed in the outer wall of the side frame 112. The gas venting path through the side frame 112 can be changed depending on the positions of the venting inlet I and the venting outlet O. Moving the venting outlet O away from the venting inlet I can lengthen the gas venting path. Preferably, as shown in FIGS. 1 and 6, if the venting outlet O is formed in the outer wall of the side frame 112a, which is arranged perpendicular to the side frames 112c and 112d in which the venting inlet I is formed, a long gas venting path extending from the horizontal to the vertical direction can be obtained.

[0068] The operation of the backflow prevention mechanism B according to the present invention will be described with reference to FIGS.

[0069] In a normal operating state of the battery pack 100 where thermal runaway does not occur, the venting inlet I is covered by the venting plate 120, so that almost no venting gas is discharged to the venting inlet I and the gas venting channel H communicating therewith. For example, when the pressure of the venting gas is not strong enough to move the plate incision 121, only a small amount of venting gas moves to the gas venting channel H through the cutting line C of the venting plate 120, i.e., the narrow gap between the plate main body 122 and the plate incision 121. The amount of venting gas discharged at this time varies depending on the size of the cutting line C. The width and length of the cutting line C may be set to a value that does not hinder the movement of the plate incision 121. For example, if the width of the cutting line C is large, the plate incision 121 may be easily moved. Furthermore, if the width and length of the cutting line C are large, a larger amount of venting gas may be sent to the gas venting channel H.

[0070] If the venting outlet O is not blocked, this small amount of venting gas may be gradually discharged to the outside, preventing a pressure increase within the battery pack 100. In this case, the cutting line C of the venting plate 120 serves as a venting hole for discharging the venting gas within the pack.

[0071] Meanwhile, when an abnormally high temperature phenomenon occurs in a battery cell or a battery module, generating a large amount of venting gas, and the pressure of the venting gas exceeds a predetermined design pressure that can move the plate cutout 121, the venting plate 120 is deformed. That is, as shown in FIGS. 4 and 5 , the plate cutout 121 moves toward the venting inlet I, using one side 121a, which is a connection portion with the venting plate 120, as a support axis. At this time, the plate cutout 121 is elastically deformed so that the end of the plate cutout 121 opposite the one side 121a moves toward the venting inlet I. The plate cutout 121, which had been covering the venting inlet I, moves toward the inside of the venting inlet I, thereby reliably opening the venting inlet I. As a result, a large amount of venting gas can move into the gas venting channel H through the venting inlet I. FIG. 5( b) illustrates the plate cutout 121 moving toward the venting inlet I, using one side as a support axis. 3, a step as large as the thickness of the inner wall of the side frame 112 is formed between the surface of the venting inlet I and the gas venting channel H. Therefore, one side 121a of the plate cutout 121 connected to the plate main body 122 and its adjacent portion can be pushed by the step portion and bend gently when the plate cutout 121 moves.

[0072] 6, the venting gas moves through a gas venting channel H formed in the side frame 112 to a venting outlet O formed in the outer wall of the side frame 112 and is then discharged to the outside of the battery pack 100 from the venting outlet O. This reduces the pressure increase per unit time within the battery pack 100, thereby preventing a chain reaction of thermal runaway within the battery pack 100. Furthermore, since flames can be discharged in addition to the venting gas through the venting path, it is possible to prevent the flames from spreading to other battery cells and modules in addition to the battery cell or module where thermal runaway has occurred.

[0073] 5, the plate cutout 121 of the venting plate 120 can move toward the venting inlet I, but its movement in the opposite direction is blocked by the blocking bracket. For example, if the pressure outside the battery pack 100 becomes higher than the pressure inside the pack for some reason, the plate cutout 121 receives pressure from the gas venting channel H toward the venting inlet I. Alternatively, if the pressure in one gas venting channel H becomes higher than the pressure in the other gas venting channel H, the venting gas pressure is applied to the venting inlet I connected to the other gas venting channel H. The plate cutout 121 is separated from the plate main body 122 by a cutting line C. Therefore, in this case, the plate cutout 121 attempts to perform a cantilever movement, moving toward the inside of the battery pack 100, i.e., toward the blocking bracket, around one side 121a due to the pressure of the venting gas. However, because the blocking bracket is fixed to the inner wall of the plate main body 122 and the side frame 112 while covering the plate cutout 121, movement of the plate cutout 121 in the direction opposite to the vent inlet I is effectively blocked. This reliably prevents vent gas from flowing back into the battery pack 100 from the gas venting channel H through the vent inlet I. The blocking bracket includes an edge frame 131 coupled to the plate main body 122 and a blocking frame 133 extending in a direction crossing the edge frame 131. The blocking frame 133 prevents the plate cutout 121 from moving toward the inside of the battery pack 100. However, because the blocking bracket has a venting hole 132 (venting space) between the blocking frame 133 and the edge frame 131, one-way movement of the vent gas inside the battery pack 100 toward the vent inlet I is permitted.

[0074] As described above, the battery pack 100 according to the present invention can discharge venting gas to the outside, thereby preventing an increase in pressure inside the pack and effectively preventing a chain reaction of thermal runaway, while the venting plate 120 and the restricting member 130 (blocking bracket) prevent the venting gas from flowing back into the pack, thereby preventing the high-temperature venting gas from spreading to adjacent battery cells or battery modules. This further enhances the safety of the battery pack 100 according to the present invention.

[0075] 6, if a vent inlet I and a gas venting channel H are formed in the horizontally installed side frames 112c and 112d, and a gas venting channel and a venting outlet O communicating with the gas venting channel H are formed in the side frames 112a and 112b that are arranged perpendicular to the side frames 112c and 112d where the vent inlet I is formed, the venting gas can be discharged through a longer path. This prevents high-temperature venting gas from being immediately discharged to the outside of the pack, thereby improving safety. In particular, as the high-temperature, high-pressure venting gas travels through the long path, the temperature and pressure decrease, further improving safety at the venting outlet O.

[0076] FIG. 7 is a diagram showing an example of a venting mechanism 113 provided at the venting outlet O of the battery pack of the present invention.

[0077] The venting mechanism 113 includes a venting cap 114 for preventing the venting gas from leaking from the venting outlet O. The venting cap 114 covers the venting outlet O and extends to the outside by a predetermined length to form a path for guiding the venting gas to the outside. Therefore, the venting path can be extended as long as the venting cap 114.

[0078] A gas sealing member 115 may be installed in the venting outlet O or the venting cap 114. The gas sealing member 115 may be, for example, a sheet-like member. The gas sealing member 115 may be deformed at or above a predetermined pressure and / or a predetermined temperature to open the venting outlet O to the outside. For example, the gas sealing member 115 may be a burst sheet configured to burst when the pressure of the venting gas exceeds a certain pressure. Alternatively, the sheet member may melt at or above a predetermined temperature to open the venting outlet O. For this purpose, the sheet member may be made of a film or foam material that is vulnerable to high temperatures.

[0079] When the venting cap 114 and the gas sealing member 115 are installed at the venting outlet O, even if a small amount of venting gas is generated inside the battery pack, the venting gas is not discharged to the outside, thereby improving the safety of the battery pack 100. In addition, by maintaining the airtightness inside the battery pack 100, the operational stability of the battery pack 100 can be enhanced. In this case, the small amount of venting gas that moves to the venting inlet I through the cutting line C of the venting plate 120 can be prevented from being discharged to the outside of the battery pack 100 by the gas sealing member 115. However, since it is difficult to maintain a completely airtight state inside the battery pack 100 in practice, a small amount of venting gas may be discharged to the outside of the pack through minute gaps in the pack housing 110 other than the gas sealing member 115.

[0080] 7, if an abnormally high temperature phenomenon occurs in a battery cell or a battery module, generating a large amount of venting gas, and the pressure inside the pack exceeds the burst pressure set for the gas sealing member 115, the gas sealing member 115 bursts to open the venting outlet O. Alternatively, if high-temperature venting gas exceeding the heat-resistance limit of the gas sealing member 115 is discharged, the gas sealing member 115 may melt to open the venting outlet O.

[0081] In this case, the pressure of the venting gas causes the plate cutout portion 121 to move into the venting inlet I, using one side, which is the connection portion with the venting plate 120, as a support axis. As a result, the venting inlet I is reliably opened, and a large amount of venting gas moves to the gas venting channel H through the venting inlet I and is discharged to the outside of the battery pack 100 through the opened venting outlet O.

[0082] This reduces the pressure increase per unit time within the battery pack 100, and can prevent thermal runaway from occurring in a chain reaction within the battery pack 100. Furthermore, since flames can be discharged in addition to venting gas through the venting path, it is possible to prevent the flames from spreading to other battery cells and modules.

[0083] At this time, the plate cutout 121 of the venting plate 120 can move toward the venting inlet I, but its movement in the opposite direction is blocked by the blocking bracket. That is, the blocking bracket completely blocks the plate cutout 121 from moving in the direction opposite the venting inlet I. This reliably prevents venting gas from flowing back from the gas venting channel H into the battery pack 100 through the venting inlet I. In particular, the present invention may further improve safety when the gas sealing member 115 is not broken even when a set pressure or temperature is reached. For example, if the gas sealing member 115 is not broken even when the set pressure or temperature is exceeded, the venting gas is not discharged through the venting outlet O. In this case, the pressure of the venting gas in the gas venting channel H increases and becomes greater than the internal pressure of the battery pack 100. Therefore, the venting gas in the gas venting channel H attempts to flow back due to the pressure toward the inside of the battery pack 100. Without a gas backflow prevention mechanism such as that of the present invention, the venting gas would flow into the battery pack 100 and instantly spread to battery cells or battery modules where thermal runaway does not occur, potentially causing a chain reaction explosion. However, the present invention can prevent or delay such a chain reaction explosion by providing the venting plate 120 and the restricting member 130 to prevent the backflow of the venting gas. Furthermore, if the pressure or temperature in the gas venting channel H increases further while the backflow of the venting gas is prevented, the gas sealing member 115 may be destroyed. That is, the backflow prevention mechanism can protect the interior of the battery pack 100 until the gas sealing member 115 is destroyed, and can also secure time until the gas sealing member 115 is destroyed. This secures a time margin for the operation of the gas sealing member, thereby improving the venting reliability of the battery pack 100.

[0084] (Second embodiment) FIG. 8 is a schematic diagram showing a battery pack according to another embodiment of the present invention, and FIG. 9 is a schematic diagram showing the operation of the venting plate 120 of FIG.

[0085] The venting plate 120 of the battery pack illustrated in FIGS. 2 to 5 includes one plate cutout 121 in the plate main body 122. In this embodiment, the venting plate 120 includes a pair of plate cutouts 121, 121' in the plate main body 122. That is, in this embodiment, cutting lines C are formed on the left and right sides of the plate main body 122, each of which opens one side, and the plate cutouts 121, 121' surrounded by the cutting lines C are provided in pairs so as to be arranged in a row. In this example, the length of each plate cutout is shorter than that of the example illustrated in FIG. 4. The plate cutouts 121, 121' with a shorter length are easily elastically deformed, so that they can perform cantilever movement even with a smaller gas pressure, and the venting inlet I can be more easily opened during venting. In addition, because the pair of plate cutouts 121, 121' move together toward the inside of the venting inlet I, the pressure of the venting gas can be uniformly distributed to the spaces formed by the movement of the pair of plate cutouts 121, 121'. In addition, because the pair of plate cutouts 121, 121' move to form open spaces, the area of ​​the open spaces toward the venting inlet I can be made larger than that of the venting plate 120 of FIG. 3. Therefore, a larger amount of venting gas can be guided to the venting inlet I.

[0086] (Third embodiment) FIG. 10 is a schematic diagram showing a battery pack according to another embodiment of the present invention, and FIG. 11 is a schematic diagram showing the operation of the venting plate 120 of FIG.

[0087] In this embodiment, a plurality of gas venting channels H are formed in the height direction of the side frame 112 of the pack housing 110. That is, a plurality of gas venting channels H are formed at predetermined intervals in the height direction of the side frame 112. In the illustrated embodiment, three gas venting channels H1, H2, and H3 are formed at predetermined intervals in the height direction, but two, four, or more gas venting channels H may be formed. Theoretically, as many gas venting channels H as necessary in the height direction may be formed within the range allowed by the side wall height of the battery pack.

[0088] For example, when the side frame 112 is manufactured by extrusion, one or more internal spaces are formed along the direction of travel of the extruded member, and these internal spaces can be used as the gas venting channel H. As shown in Figures 2 and 3, if one large hollow is formed in the side frame 112 and used as the gas venting channel H, the amount of vent gas discharged can be increased, but the mechanical rigidity of the side frame 112 may be insufficient.

[0089] 10, forming a rib-shaped partition R in the hollow space can increase the mechanical rigidity of the side frame 112 while reducing the weight of the pack housing 110. Also, by forming a plurality of gas venting channels H1, H2, and H3 in the height direction, when gas is generated at a specific portion along the height direction of the battery cell or battery module, the venting gas can be suitably guided to the gas venting channel H according to the position.

[0090] In this case, three venting inlets are also formed on the inner wall of the side frame 112 corresponding to the gas venting channels H1, H2, and H3. Referring to FIG. 10 , three venting inlets I1, I2, and I3 are formed on the inner wall of the side frame 112 along the height direction, and the venting inlets I1, I2, and I3 are respectively connected to the gas venting channels H1, H2, and H3. In this case, to prevent the venting gas from flowing back into the battery while moving to the venting inlets I1, I2, and I3, the venting plate 120 and the restricting member 130 may be installed on the venting inlets I1, I2, and I3 on ​​the inner wall of the side frame 112. That is, three backflow prevention mechanisms B of the present invention may be installed corresponding to the number of venting inlets I1, I2, and I3 and gas venting channels H1, H2, and H3.

[0091] However, in the embodiment of FIG. 10 , only one backflow prevention mechanism B covering the venting inlet I is installed, simplifying the device configuration. That is, only one venting plate 120 and one blocking bracket 130 constituting the backflow prevention mechanism B are installed for each venting inlet I and gas venting channel H, thereby reducing device manufacturing costs. Instead, a plurality of plate cutouts are formed on the venting plate 120 to open and close each venting inlet I, corresponding to the number of venting inlets I. Referring to FIGS. 10 and 11 , the venting plate 120 has one plate main body 122 and three plate cutouts 121, 123, and 125 spaced at predetermined intervals in the height direction to correspond to the number of gas venting channels H1, H2, and H3 and venting inlets I1, I2, and I3. That is, three geometric cutting lines C with one open side are provided in the height direction on the plate main body 122. Therefore, the number of plate incisions 121, 123, 125 surrounded by the cutting line C is also three.

[0092] With the plate cutouts 121, 123, 125 positioned over the respective venting inlets I1, I2, I3, the plate body 122 is coupled to the side frame 112, covering the entire periphery of each venting inlet I on the inner wall of the side frame 112.

[0093] Also, only one blocking bracket, which is the restricting member 130, may be provided, and this single blocking bracket may be coupled to the venting plate 120 while covering all three plate cutouts 121, 123, and 125.

[0094] In this embodiment, a small amount of venting gas may flow into the gas venting channels H1, H2, and H3 through the three cutting lines C. When a large amount of venting gas is generated and exceeds a predetermined pressure, the three plate cutouts 121, 123, and 125 may move into the corresponding venting inlets I1, I2, and I3, respectively, as shown in FIG. 11 , to guide the large amount of venting gas into the gas venting channels H1, H2, and H3. In this case, the plate cutouts 121, 123, and 125 may open the corresponding venting inlets I1, I2, and I3 in the height direction, and the venting gas may move into the gas venting channels H1, H2, and H3 connected to the venting inlets I1, I2, and I3, respectively, and finally be discharged to the venting outlet O formed in the outer wall of the side frame 112.

[0095] (Fourth embodiment) FIG. 12 is a schematic diagram showing a battery pack according to another embodiment of the present invention, and FIG. 13 is a schematic diagram showing the operation of the venting plate of FIG.

[0096] 9, the venting plate 120 of this embodiment has plate cutouts 121 formed in pairs on the left and right sides of the plate main body 122. Also, as shown in FIGS. 10 and 11, the venting plate 120 has three plate cutouts at predetermined intervals in the height direction to correspond to the gas venting channels H. Therefore, in this embodiment, three pairs of plate cutouts 121, 121', 123, 123', 125, 125' are provided in the height direction.

[0097] This venting plate 120 can also be made easier to elastically deform because the length of the plate cutouts can be reduced, like the venting plate 120 in Fig. 9. Also, as the number of plate cutouts increases, the open area to each venting inlet I increases, as shown in Fig. 13, making it easier to discharge a large amount of vent gas into the gas venting channel H.

[0098] (Fifth embodiment) FIG. 14 is a schematic diagram showing a battery pack according to another embodiment of the present invention.

[0099] This embodiment relates to a battery pack 200 in which a plurality of battery modules are accommodated in a pack housing.

[0100] As shown in the figure, a plurality of battery modules, for example, six battery modules M1 to M6, are accommodated on a base plate 211 of a pack housing 210, and a side frame 212 is coupled along the edge of the base plate 211 while surrounding the six battery modules M1 to M6 to form the pack housing 210.

[0101] A plurality of battery cells may be accommodated in a module case of the battery module. To this end, the module case may be provided with an accommodation space for accommodating the plurality of battery cells. The battery pack includes a plurality of battery modules, an electrical component assembly (not shown), and a pack housing.

[0102] The electrical equipment assembly may house a relay device, a current sensor, a fuse, a BMS, an MSD (Manual Service Disconnector), etc. Such an electrical equipment assembly may be packaged together with the battery module by the pack housing so that it is not exposed to the outside.

[0103] The pack housing 210 of Fig. 14 is slightly different in shape from the pack housing of Fig. 1 so that it can accommodate multiple battery modules. That is, the pack housing 210 of Fig. 14 has a center frame 214 on a base plate 211, and a partition wall (cross beam 215) installed between the center frame 214 and side frames 212 to partition and install the battery modules. Side frames 212 are installed on the base plate 211 along the edges of the battery modules. In addition, a pack cover (not shown) covers the battery modules and is installed on top of the side frames 212. That is, the pack cover, side frames 212, base plate 211, center frame 214, and cross beam 215 constitute the pack housing 210 that accommodates the modules.

[0104] The side frame 212 has a hollow gas venting channel H therein. When one gas venting channel H is formed along the side frame 212 as shown in Fig. 14, venting inlets I1, I2, and I3 communicating with the one gas venting channel H may be formed for each battery module. In addition, a venting outlet O communicating with the gas venting channel H or a venting mechanism 213 as shown in Fig. 7 may be formed on one outer wall of the side frame 212.

[0105] A venting plate 220 and a blocking bracket 230 according to the present invention are installed on each venting inlet I. In this case, as shown in Fig. 14, it is preferable that the venting inlet I and the backflow prevention mechanisms B1, B2, and B3 are installed on the inner walls of the side frames 212c and 212d on both sides of the battery module, respectively. This allows venting gas to be discharged in a balanced manner from the battery modules arranged on both sides inside the battery pack to the venting inlets I1, I2, and I3. In addition, venting gas can be moved in a balanced manner from the side frames 212c and 212d on both sides toward the front frame (front side frame 212a) arranged perpendicular to them.

[0106] In addition, it is preferable that venting inlets I1, I2, I3 and backflow prevention mechanisms B1, B2, B3 are provided on the inner wall of the side frame 212 on the side where the terminal portions of the battery modules are formed. Because venting gas is likely to be generated at the module terminal portions, forming venting inlets I1, I2, I3 on ​​the inner wall of the side frame 212 facing these terminal portions allows the venting gas to be more easily discharged to the outside.

[0107] In this embodiment, the backflow prevention mechanisms B1, B2, and B3 installed on the venting inlets I1, I2, and I3 respectively allow the venting gas to be discharged in one direction to the venting inlets I1, I2, and I3 while preventing the venting gas from flowing back into the battery module.

[0108] As a result, even if the pressure of the venting gas discharged from a particular battery module is high, the backflow prevention mechanisms B1, B2, and B3 can prevent the venting gas from flowing back into other adjacent battery modules.

[0109] (Sixth embodiment) FIG. 15 is a schematic diagram showing a battery pack according to another embodiment of the present invention.

[0110] 12, the present embodiment is provided with a plurality of gas venting channels H1, H2, and H3 along the height direction of the side frame 212. When the internal space of the side frame 212 is partitioned by partition walls R such as ribs, the internal space can be divided into a plurality of gas venting channels H1, H2, and H3. In addition, the mechanical rigidity of the side frame 212 can be maintained by the rigidity of the ribs.

[0111] In this case, each of the gas venting channels H1, H2, and H3 positioned along the height direction can be assigned as a dedicated gas venting channel for gas venting of each battery module.

[0112] 15 , of the three gas venting channels H1, H2, and H3 arranged along the height direction, the uppermost gas venting channel H1 may form a venting inlet I1 in the inner wall of the uppermost side frame 212 facing the M1 battery module to communicate with the M1 battery module. The middle gas venting channel H2 may form a venting inlet I2 in the middle of the inner wall of the side frame 212 facing the M2 battery module to communicate with the M2 battery module. The lowermost gas venting channel H3 may form a venting inlet I3 in the lowermost part of the inner wall of the side frame 212 facing the M3 battery module to communicate with the M3 battery module. This prevents high-temperature venting gas from flowing between adjacent battery modules within the battery pack, and allows venting gas generated in each battery module to be efficiently and quickly discharged to the respective venting inlets I1, I2, and I3. In addition, since each module has its own dedicated gas venting channels H1, H2, and H3, the venting gas generated in one module is less likely to flow into the gas venting channels H1, H2, and H3 of other modules at the venting inlets I1, I2, and I3, which further reduces the backflow of venting gas caused by pressure interference between gas venting channels.

[0113] In addition, a venting plate 120 and a blocking bracket 130 may be installed at each of the venting inlets I1, I2, and I3 arranged along the height direction of each gas venting channel. Therefore, in this embodiment, the safety of the battery pack can be further improved by the dedicated gas venting channels H1, H2, and H3 and the backflow prevention mechanism B.

[0114] That is, among the three gas venting channels H1, H2, and H3, a dedicated venting plate 120 and a blocking bracket 130 may be installed at the venting inlet I1 of the uppermost gas venting channel H1, which communicates with the M1 battery module. A separate dedicated venting plate 120' and a blocking bracket 130' may also be installed at the venting inlet I2 of the middle gas venting channel H2. A separate dedicated venting plate 120'' and a blocking bracket 130'' may be installed at the venting inlet I3, which communicates with the lowermost gas venting channel H3. When venting gas is generated, the plate cutouts 121, 121', and 121'' move from the plate main bodies 122, 122', and 122'' of the venting plates 120, 120', and 120'' into the venting inlets I1, I2, and I3, allowing the venting gas to be discharged to the gas venting channels H1, H2, and H3.

[0115] Similarly, three gas venting channels H1, H2, and H3 may be formed along the height direction on the side frame 212 facing M4, M5, and M6, which are located on the opposite side of M1, M2, and M3. Venting inlets communicating with each battery module and the gas venting channel H may also be formed on the inner wall of the opposing side frame 212, and a venting plate and a blocking bracket may be installed on each venting inlet.

[0116] This allows venting gas to be efficiently discharged from each battery module to the gas venting channel assigned to that module, while preventing gas from flowing back from the gas venting channel to each battery module.

[0117] Meanwhile, when a plurality of gas venting channels H1, H2, and H3 are formed in each side frame 212 along the height direction, the venting gas of each gas venting channel may be converged and discharged at the outlet end of each gas venting channel, i.e., at a venting outlet O formed in the outer wall of the side frame 212. To this end, the side frame 212 may be shaped so that the plurality of gas venting channels converge near the venting outlet O.

[0118] The number of venting outlets O may also be determined depending on the positions where the venting inlets I are formed. For example, when the venting inlets I are formed on the inner walls of the side frames 112c, 112d, 212c, and 212d arranged on both the left and right sides of the battery cell or battery module as shown in FIGS. 1, 6, and 14, the venting outlets O may be formed at two locations on both the left and right sides of the outer walls of the side frames 112a and 212a arranged perpendicular to the side frames 112c, 112d, 212c, and 212d in which the venting inlets I are formed. This allows venting gas to be discharged in a balanced manner to both sides of the battery pack.

[0119] According to the various embodiments described above, it is possible to provide a power storage device (not shown separately) including the battery pack, which has improved safety by efficiently discharging venting gas while preventing backflow.

[0120] In addition, one embodiment of the present invention may provide a vehicle (not shown) including the battery pack, which has improved safety by efficiently exhausting vent gas while preventing backflow.

[0121] 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 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 by the scope of the claims, and all technical concepts within the equivalent range should be interpreted as being included in the scope of the present invention.

[0122] Meanwhile, 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 for convenience of explanation and may change depending on the position of the object of interest, the position of the observer, etc. [Explanation of symbols]

[0123] 10: Battery cell stack 100, 200: Battery pack 110, 210: Pack housing 111, 211: Base plate 112, 212: Side frame 113, 213: Venting mechanism 114: Venting cap 115: Gas sealing member B, B1, B2, B3: Backflow prevention mechanism 120, 220: Venting plate 121, 121': Plate incision 123, 123': Plate incision 125, 125': Plate incision 122: Plate body C: Cutting line 130, 130', 130'', 230: Restricting member (blocking bracket) 131: Edge frame 132: Venting Hall 133: Blocking frame H, H1, H2, H3: Gas venting channels I, I1, I2, I3: Venting inlets R: Bulkhead O: Venting outlet M1~M6: Battery modules 214: Center frame 215: Cross beam

Claims

1. A battery pack containing a plurality of battery cells or a plurality of battery modules, a pack housing including a side frame having a gas venting channel formed therein and a venting inlet communicating with the gas venting channel formed in at least one location on an inner wall facing the battery cell or battery module; a venting plate including a plate cutout portion surrounded by a cutting line having a shape with one side open and a plate body portion surrounding the plate cutout portion, the venting plate covering the venting inlet and coupled to an inner wall of the side frame; a restricting member that is attached to the venting plate on an inner side of the venting plate opposite to the venting inlet and covers the plate cutout, a plate cutout portion that is movable toward the inside of the vent inlet using one side edge connected to the plate main body portion as a support axis, but whose movement in a direction opposite to the vent inlet is blocked by the restricting member.

2. The battery pack according to claim 1 , wherein the gas venting channel is formed in the side frame along an edge of the battery cell or battery module.

3. the venting inlets are formed in the inner walls of the side frames on both sides of the battery cell or battery module, respectively; The battery pack according to claim 1 , wherein the venting plate and the restricting member are respectively installed on the venting inlet.

4. the venting inlet is formed in an inner wall of the side frame facing a terminal portion of the battery cell or a terminal portion of the battery module, The battery pack according to claim 1 , wherein the venting plate and the restricting member are installed on the venting inlet.

5. 2. The battery pack according to claim 1, wherein the vent opening is formed to a predetermined length along a longitudinal direction of the side frame, and the plate cutout is formed to a size that allows insertion into the vent opening.

6. The battery pack according to claim 1 , wherein the plate main body is coupled to an inner wall of the side frame around the vent inlet with the plate cutout positioned above the vent inlet.

7. The battery pack according to claim 6 , wherein the restricting member is a blocking bracket having a vent hole in a portion facing the plate cutout and a blocking frame that blocks movement of the plate cutout.

8. The battery pack according to claim 7 , wherein the edge of the isolation bracket and the plate body are fastened together to the inner wall of the side frame around the venting inlet by fastening members.

9. The battery pack according to claim 1 , wherein a venting outlet communicating with the gas venting channel is formed in an outer wall of the side frame.

10. The battery pack according to claim 9 , wherein the vent outlet is formed in an outer wall of the side frame that is disposed perpendicular to the side frame in which the vent inlet is formed.

11. The battery pack according to claim 9 , further comprising a venting cap extending to the outside and covering the venting outlet.

12. 12. The battery pack of claim 11, further comprising a gas sealing member installed in the vent outlet or the venting cap, the gas sealing member being deformed at or above a predetermined pressure and / or a predetermined temperature to open the vent outlet to the outside.

13. The battery pack according to claim 1 , wherein the plate cutouts are formed in pairs on the plate body.

14. The gas venting channels are formed in a plurality at predetermined intervals in the height direction of the side frame, The battery pack according to claim 1 , wherein the venting plate and the restricting member are installed on each venting inlet of the inner wall of the side frame that communicates with each of the gas venting channels.

15. the venting plate includes one plate body portion and a plurality of plate cutouts formed at predetermined intervals in a height direction to correspond to the gas venting channels, With each of the plate cutouts positioned above each of the venting inlets, the plate main body is connected to the side frame while completely covering the periphery of each of the venting inlets of the inner wall of the side frame, The battery pack according to claim 14 , wherein one of the restricting members covers the plate cutout and is coupled to the venting plate.

16. A power storage device comprising the battery pack according to any one of claims 1 to 15.

17. A motor vehicle comprising a battery pack according to any one of claims 1 to 15.

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