Battery pack, power storage device including the same, and motor vehicle

Abstract

The present invention relates to a battery pack that accommodates battery cells or battery modules, and relates to a battery pack that can efficiently exhaust venting gas generated within the battery pack to the outside of the battery pack through a venting inlet formed in a side frame, while preventing the venting gas from flowing back into the battery pack by a backflow prevention mechanism that can open and close the venting inlet in one direction.

Description

Technical Field

[0001] The present invention relates to a battery pack for accommodating a battery cell or a battery module.

[0002] More specifically, the present invention relates to a battery pack capable of efficiently discharging venting gas generated inside 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, filed on July 6, 2022, and all of the contents disclosed in the document of the Korean patent application are incorporated herein by reference.

Background Art

[0005] 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 can be repeatedly charged and discharged by an electrochemical reaction between components including a positive electrode and a negative electrode current collector, a separator, an active material, an electrolyte, and the like.

[0006] A secondary battery can generate gas internally at any time while repeating charge and discharge, and this gas is called venting gas. For example, when an overcurrent flows, the temperature inside the secondary battery rises rapidly. Such a rapid rise in temperature can cause a decomposition reaction of the electrolyte and generate gas. When gas is generated from the secondary battery inside the battery pack, such gas may be collected inside the pack and cause the battery pack to explode, or may flow into the interior of a vehicle or the like through a cooling duct of the battery pack. Therefore, the battery pack is provided with a venting mechanism such as a gas venting channel that discharges the internal gas to the outside and reduces the internal pressure.

[0007] For example, when thermal runaway occurs in one of a plurality of battery modules installed in a battery pack and venting gas is generated, the venting gas can be discharged through the above venting mechanism.

[0008] However, there is a case where the above venting gas is not discharged to the outside and flows back into the battery pack. For example, when the rupture sheet installed at the venting outlet of the gas venting channel does not rupture even though the set pressure is reached and the pressure in the gas venting channel becomes larger, the venting gas may rather flow back into the battery pack. Alternatively, when thermal runaway occurs in a plurality of battery modules, it is also conceivable that the venting gas flows back through the gas venting channel from the battery module side with a higher thermal runaway pressure to the battery module with a lower pressure.

[0009] In this case, the gas venting channel for discharging the venting gas rather becomes a passage for transmitting thermal runaway to other modules, and there is a risk of simultaneous occurrence of thermal runaway.

Prior Art Documents

Patent Documents

[0010]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0011] The present invention is for solving the above problems, and provides a battery pack capable of preventing or delaying the propagation of thermal runaway by smoothly discharging venting gas and simultaneously preventing its backflow, and a power storage device and an automobile including the same.

Means for Solving the Problems

[0012] In order to solve the above problems, a battery pack according to an embodiment of the present invention is a battery pack in which a plurality of battery cells or a plurality of battery modules are accommodated, a gas venting channel is formed inside, and a side frame including a venting inlet communicating with the gas venting channel is formed at at least one location on the inner wall facing the battery cell or battery module, a plate cutting portion surrounded by a cutting line in a figure shape with one side open, and a plate main body portion surrounding the plate cutting portion, a venting plate covering the venting inlet and coupled to the inner wall of the side frame, and a restricting member covering the plate cutting portion and coupled to the venting plate inside the venting plate on the side opposite to the venting inlet, and the plate cutting portion can move inside the venting inlet with one side connected to the plate main body portion as a support shaft, but movement in the direction opposite to the venting inlet is blocked by the restricting member.

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

[0014] The bending inlet is formed on the inner walls of the side frames on both sides of the battery cell or battery module, respectively, and the bending plate and the restricting member can be installed on the bending inlet, respectively.

[0015] Alternatively, the bending inlet is formed on the inner wall of the side frame facing the terminal portion of the battery cell or the terminal portion of the battery module, and the bending plate and the restricting member can be installed on the bending inlet.

[0016] Alternatively, the bending inlet is formed to have a predetermined length along the longitudinal direction of the side frame, and the plate cutting portion can be formed to have a size that can be inserted into the bending inlet.

[0017] With the plate cutting portion positioned on the bending inlet, the plate main body portion can be coupled to the inner wall of the side frame around the bending inlet.

[0018] The restricting member can be a blocking bracket provided with a bending hole and a blocking frame that blocks the movement of the plate cutting portion at a portion facing the plate cutting portion.

[0019] Alternatively, the edge of the blocking bracket and the plate main body portion can be fastened together to the inner wall of the side frame around the bending inlet by a fastening member.

[0020] On the other hand, a bending outlet communicating with the gas bending channel can be formed on the outer wall of the side frame.

[0021] In this case, the bending outlet can be formed on the outer wall of the side frame arranged perpendicular to the side frame on which the bending inlet is formed.

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

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

[0024] The plate incision portion may be formed in pairs on the plate main body portion.

[0025] A plurality of the gas venting channels are 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 communicating with each gas venting channel.

[0026] Further, the venting plate includes one plate main body portion and a plurality of plate incision portions formed at predetermined intervals in the height direction so as to correspond to the gas venting channels. With each plate incision portion positioned above each venting inlet, the plate main body portion covers all around each venting inlet of the inner wall of the side frame and is coupled to the side frame, and one regulating member may cover the plate incision portion and be coupled to the venting plate.

[0027] On the other hand, an embodiment of the present invention provides a power storage device including the battery pack described above.

[0028] Also, an embodiment of the present invention provides an automobile including the battery pack described above.

Effect of the Invention

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

[0030] In addition, according to the various embodiments as described above, by preventing the venting gas in the gas venting channel from flowing backward into the battery pack, it is possible to prevent thermal runaway from spreading to adjacent battery modules.

Brief Description of the Drawings

[0031]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Best Mode for Carrying Out the Invention

[0032] The present invention will become clearer by explaining in detail the preferred embodiments of the present invention with reference to the attached drawings. The embodiments described herein are shown exemplarily to assist in understanding the invention, and it should be understood that the present invention can be implemented in various modifications different from the embodiments described herein. Also, the attached drawings for assisting in understanding the invention are not illustrated at an actual scale, and the dimensions of some components may be exaggerated.

[0033] Hereinafter, the present invention will be described in detail.

[0034] A battery pack according to an embodiment of the present invention is a battery pack in which a plurality of battery cells or a plurality of battery modules are housed, a gas venting channel is formed inside, and a side frame including a venting inlet communicating with the gas venting channel is formed at at least one location on the inner wall facing the battery cell or the battery module. The battery pack includes a plate cutting portion surrounded by a cutting line having a figure shape with one side open, and a plate main body portion surrounding the plate cutting portion. The battery pack further includes a venting plate covering the venting inlet and coupled to the inner wall of the side frame, and a restricting member covering the plate cutting portion and coupled to the venting plate inside the venting plate on the side opposite to the venting inlet. The plate cutting portion is movable inward of the venting inlet with one side connected to the plate main body portion as a support axis, but movement in the direction opposite to the venting inlet is blocked by the restricting member.

[0035] On the other hand, an embodiment of the present invention provides a power storage device including the above-described battery pack.

[0036] Further, an embodiment of the present invention provides an automobile including the above-described battery pack.

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

[0038] Referring to FIGS. 1 to 4, the 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 regulating member 130.

[0039] The battery cell 11 is a secondary battery and can be a pouch-type secondary battery, a prismatic secondary battery, or a cylindrical secondary battery. Hereinafter, in the present embodiment, the battery cell will be described by 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 can be stacked and arranged so as to be electrically connected to each other. The battery pack 100 of the present invention may accommodate a plurality of battery cell stacks 10 as shown in FIG. 1, or may accommodate a plurality of battery modules as in other embodiments described later. A battery pack that accommodates battery modules is a conventionally commonly used battery pack. However, recently, a so-called cell-to-pack type battery pack has been developed that simplifies the structure of the battery pack and directly constitutes the battery pack from the battery cells without modules. The battery pack 100 in FIG. 1 is also intended to have a cell-to-pack structure, and a plurality of battery cells 11 are accommodated without modules. In order to obtain the electric capacity of the battery pack unit, more battery cells than the battery cells provided in the module can be stacked and arranged in the battery pack 100. Alternatively, large and high-capacity battery cells larger than ordinary battery cells can be arranged 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) inside. Further, the pack housing 110 is a structure provided with a predetermined bracket so as to be coupled to the vehicle body of the vehicle.

[0042] Specifically, the pack housing 110 may include a base plate 111 on which the battery cells are seated, a side frame 112 formed along the edge of the base plate 111, and a pack cover (not shown) that covers the upper part of the battery cells and is coupled to the side frame 112. As will be described later, the structure of the pack housing 110 that accommodates battery modules is different from this embodiment.

[0043] Specifically, the side frame 112 is 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 a wall. In a specific pack housing 110, only the right frame 112c and the left frame 112d may be referred to as the side frame 112. However, in the present invention, since a gas venting channel and a backflow prevention mechanism B (described later) can be installed in all the frames forming the wall of the pack housing 110, the front frame 112a and the rear frame 112b may also be defined as the side frame 112.

[0044] The pack housing 110 can be assembled by welding and bolting the base plate 111 and the frames.

[0045] As shown in FIGS. 2 and 3, the side frame 112 is a hollow frame in which a gas venting channel H is formed inside. For example, the side frame 112 can be manufactured by extruding aluminum so that an empty space is formed inside. By configuring the frame in a hollow shape in this way, the weight of the pack housing 110 can be reduced. Further, if a rib-shaped partition is formed in the space, the mechanical rigidity of the frame can be maintained at a reliable level. Also, in this case, as will be described later, a plurality of gas venting channels H can be formed inside the frame by the partition, so that the gas discharge effect can be improved.

[0046] The side frame 112 is provided with a venting inlet I through which venting gas flows into at least one location on the inner wall facing the battery cell. The venting inlet I communicates with the gas venting channel H inside the side frame 112, and the 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 frame 112 is arranged along the edge of the battery cell, and the gas venting channel H can also be formed in the side frame 112 along the edge of the battery cell. 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 channel H with a long path along the side frame 112. In this process, the incompletely burned venting gas can be completely burned, or the temperature and pressure of the high-temperature and high-pressure venting gas can be reduced. That is, by lengthening the venting path, the unstable state of the venting gas can be stabilized, so the risk of accidents caused by the venting gas can be reduced.

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

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

[0050] Referring to FIGS. 2 and 3, the above-mentioned backflow prevention mechanism B is installed on the venting inlet I. Since 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. In addition, in order to install it in the passage, there is a difficulty that the components included in the check valve need to be designed smaller and more precisely. In the present invention, since the backflow prevention mechanism B is installed on the inner wall of the side frame 112 exposed to the outside on the venting inlet I side, the backflow prevention mechanism B can be easily attached to the pack housing 110. Further, since the backflow prevention mechanism B is configured to block the venting inlet I itself, as will be described later, the components of the backflow prevention mechanism B can be made relatively large and the manufacturing is easy. In particular, when a check valve or the like is installed in the passage of the gas venting channel, it is not known whether the backflow of the venting gas in the passage portion after the check valve can be prevented. However, when a 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 that the backflow of the venting gas cannot be prevented.

[0051] The present invention has an advantage that the backflow prevention mechanism B is installed on the venting inlet I itself, and the propagation of the venting gas to other battery cells or battery modules can be blocked at the source.

[0052] Referring to FIGS. 2 and 3, the backflow prevention mechanism B of the present invention includes a venting plate 120 and a regulating member 130.

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

[0054] One side 121a of the plate cutting portion 121 extends from the plate main body portion 122, and the cutting line C is not formed. The other side of the plate cutting portion 121 is separated from the plate main body portion 122 by the cutting line C. Therefore, the plate cutting portion 121, which is the plate portion surrounded by the cutting line C, can move to the bending inlet I side or the opposite side with the one side 121a as the support axis as shown in FIG. 4. For example, due to the pressure of the bending gas, the plate cutting portion 121 can perform a cantilever movement of moving toward the bending inlet I around the support axis. More specifically, one end of the plate cutting portion 121 can be elastically deformed to bend toward the bending inlet I or the opposite direction around the support axis. In FIGS. 2 to 4, the cutting line C is formed in a U shape, and the plate cutting portion 121 has a substantially rectangular shape with one side 121a open. However, the shapes of the cutting line C and the plate cutting portion 121 are not limited to this. As long as one side is connected to the plate main body portion 122, the cutting line C and the plate cutting portion 121 can also have a triangular shape with one side open, a circular shape with one side portion open, an elliptical shape, or other polygonal shapes. However, since the plate cutting portion 121 serves to move into the bending inlet I and open the bending inlet I, its size can be determined in consideration of the size of the bending inlet I. For example, the bending inlet I can be formed to have a predetermined length along the longitudinal direction of the side frame 112 as shown in FIG. 2. That is, the bending inlet I can be formed long in an elliptical or rectangular form for efficient discharge of the bending gas. Accordingly, the plate cutting portion 121 can also be formed long to a length corresponding to the bending inlet I and formed to a size that can be inserted into the bending inlet I.

[0055] The above-mentioned venting inlet I is open towards the inside of the battery pack 100 on the inner wall of the side frame 112. Further, since the above-mentioned venting inlet I communicates with the gas venting channel H, a short communication space corresponding to the inner wall thickness of the side frame 112 is formed between the above-mentioned venting inlet I and the above-mentioned gas venting channel H. The above-mentioned plate cutting portion 121 can move into the above-mentioned communication space through the venting inlet I with one side as a support shaft. That is, the above-mentioned communication space becomes a spare space in which the plate cutting portion 121 can move between the venting inlet I and the gas venting channel H.

[0056] The above-mentioned venting plate 120 may be made of a material in which the plate cutting portion 121 can be elastically deformed about one side. However, it must be made of a material that can withstand the high-temperature and high-pressure venting gas generated in the battery pack 100. For example, the above-mentioned venting plate 120 can be made of a metal material such as steel or stainless steel.

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

[0058] Specifically, in a state where the above-mentioned plate cutting portion 121 is located on the above-mentioned venting inlet I, the plate main body portion 122 is coupled to the inner wall of the side frame 112 around the above-mentioned venting inlet I. For the coupling of 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 portion 122, and the venting plate 120 can be coupled to the venting inlet portion of the side frame 112 by a fastening member. Alternatively, the venting plate 120 can also 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 portion 122 around the plate cutting portion 121 serves to support it when the plate cutting portion 121 moves, so the above-mentioned plate main body portion 122 needs to be firmly coupled to the inner wall of the side frame 112.

[0059] Referring to FIG. 2, on the inner side of the bending plate 120, that is, on the side surface of the bending plate 120 opposite to the bending inlet I, a regulating member 130 for regulating the movement of the plate cutting portion 121 is located. The regulating member 130 is coupled to the bending plate 120 so as to cover at least the plate cutting portion 121.

[0060] The regulating member 130 may be a bracket-shaped member that blocks the movement of the plate cutting portion 121. In FIG. 2, a rectangular frame-shaped blocking bracket corresponding to the form of the bending inlet I and the plate cutting portion 121 is illustrated as the regulating member 130. The blocking bracket only blocks the movement of the plate cutting portion 121 and must allow the flow of bending gas. Therefore, a bending hole 132, which is a passage for bending gas, is provided in a portion of the blocking bracket facing the plate cutting portion 121. Also, a blocking frame 133 for blocking the movement of the plate cutting portion 121 is installed at a substantially central portion of the blocking bracket, which is the opposing portion. That is, the blocking bracket of the present embodiment regulates the movement of the bending plate 120 by the edge frame 131 of the rectangular frame and the blocking frame 133 near the bending hole 132.

[0061] The size and shape of the blocking bracket can be suitably determined in consideration of the bonding area with the bending plate 120, the ease of blocking the plate cutting portion 121, and the like. Also, the size, position, and number of the bending 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 can be suitably changed in consideration of the ease of blocking the plate cutting portion 121 and the like.

[0062] The material of the above-mentioned blocking bracket can adopt materials such as metals and plastic resins that can withstand high-temperature and high-pressure venting gas. As shown in Figure 3, the edge frame 131 of the blocking bracket can be coupled to the bending plate main body 122. In this case, the edge portion (edge frame 131) of the blocking bracket and the plate main body 122 can be fastened together to the inner wall of the side frame 112 around the bending inlet I by a fastening member. Therefore, the installation work of the backflow prevention mechanism B can be easily carried out by a single fastening operation. Also, since the edge frame 131 of the blocking bracket is firmly fastened to the inner wall of the side frame 112 together with the plate main body 122, the plate cutting portion 121 can be stably elastically deformed while being supported by this fastening portion.

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

[0064] The backflow prevention mechanism B including the above-mentioned bending plate 120 and the regulating member 130 (blocking bracket) can be installed at at least one location on the inner wall facing the battery cell or the battery module. Also, for efficient gas discharge, the bending inlet I can be formed on the inner walls of the side frames 112 on at least both sides of the above-mentioned battery cell or battery module. In this case, the bending plate 120 and the regulating member 130 can be respectively installed on the bending inlet (see Figure 1). When the bending inlet I is formed on both side frames 112, the venting gas generated on both sides inside the battery pack 100 can be discharged simultaneously, so that the venting gas can be discharged quickly. Also, it is possible to prevent the venting gas from being discharged with an imbalance towards the bending inlet I on one side, so that the internal pressure inside the battery pack 100 can be maintained in good balance. When the bending inlet I is formed on both side frames 112, in order to prevent the backflow of gas, the bending plate 120 and the regulating member 130 are installed on each bending inlet I on both sides.

[0065] In addition, since the terminal portion 12 of the battery cell or the terminal portion of the battery module is likely to generate high-temperature venting gas, it is preferable to install a venting inlet I and the above-mentioned backflow prevention mechanism B on the inner wall of the side frame 112 facing it (see FIG. 1).

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

[0067] As shown in FIG. 1, a venting outlet O communicating with the gas venting channel H is formed on the outer wall of the side frame 112. Depending on the positions of the venting inlet I and the venting outlet O, the gas venting path through the side frame 112 can change. 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, when the venting outlet O is formed on the outer wall of the side frame 112a arranged perpendicular to the side frames 112c and 112d where the venting inlet I is formed, a long gas venting path that continues from the horizontal direction to the vertical direction can be obtained.

[0068] With reference to FIGS. 1, 4, 5, and 6, the operation of the backflow prevention mechanism B according to the present invention will be described.

[0069] In the operating state of the normal battery pack 100 where thermal runaway does not occur, since the venting inlet I is covered by the venting plate 120, almost no venting gas is discharged into the venting inlet I and the gas venting channel H communicating therewith. For example, when the pressure of the venting gas is not large enough to move the plate cutting portion 121, only a small amount of venting gas moves into the gas venting channel H through the cutting line C of the venting plate 120, that is, the narrow gap between the plate main body portion 122 and the plate cutting portion 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 can be set to such an extent that they do not prevent the movement of the plate cutting portion 121. For example, if the width of the cutting line C is large, the plate cutting portion 121 can be easily moved. Also, if the width and length of the cutting line C are large, a larger amount of venting gas can be sent into the gas venting channel H.

[0070] When the venting outlet O is not blocked, if such a small amount of venting gas is discharged little by little to the outside in this way, it can prevent the pressure inside the battery pack 100 from rising. In this case, the cutting line C of the venting plate 120 will serve as a venting hole for discharging the venting gas inside the pack.

[0071] On one hand, when an abnormal overheating 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 capable of moving the plate cutout 121, the venting plate 120 is deformed. That is, as shown in FIGS. 4 and 5, the plate cutout 121 moves into the venting inlet I with one side 121a, which is the connecting part between the plate cutout 121 and the venting plate 120, as the support axis. At this time, the plate cutout 121 is elastically deformed so that the end of the plate cutout 121 on the side opposite to the one side 121a faces the venting inlet I. When the plate cutout 121 covering the venting inlet I moves inside the venting inlet I, the venting inlet I is surely opened. As a result, a large amount of venting gas can move into the gas venting channel H through the venting inlet I. In FIG. 5(b), it is shown that the plate cutout 121 moves toward the venting inlet I with one side as the support axis. Referring to FIG. 3, a step as thick as the inner wall thickness 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 following the plate main body portion 122 and the adjacent part can be gently bent by being pushed by the step portion when the plate cutout 121 moves.

[0072] As shown in FIG. 6, the venting gas moves through the gas venting channel H formed in the side frame 112 to the venting outlet O formed on the outer wall of the side frame 112, and is discharged from the venting outlet O to the outside of the battery pack 100. Therefore, the pressure increase per unit time inside the battery pack 100 can be reduced, and the occurrence of thermal runaway in the battery pack 100 can be prevented from occurring in a chain. Also, since flames can be discharged in addition to the venting gas through the venting path, the propagation of flames to other battery cells and modules can be prevented in addition to the battery cell or module where thermal runaway has occurred.

[0073] At this time, as shown in FIG. 5, the plate cutout portion 121 of the bending plate 120 can move toward the bending inlet I side, but the movement in the opposite direction is blocked by the blocking bracket. For example, when the external pressure of the battery pack 100 becomes higher than the internal pressure of the pack for some reason, the plate cutout portion 121 receives the pressure in the direction from the gas venting channel H side toward the bending inlet I. Alternatively, when the pressure of one gas venting channel H becomes higher than the pressure of the other gas venting channel H, the pressure of the venting gas is applied to the bending inlet I connected to the other gas venting channel H. The plate cutout portion 121 is separated from the plate main body portion 122 by the cutting line C. Therefore, in this case, the plate cutout portion 121 tries to perform a cantilever movement of moving inward of the battery pack 100, that is, toward the blocking bracket, with one side 121a as the center by the pressure of the venting gas. However, since the blocking bracket is fixed to the inner walls of the plate main body portion 122 and the side frame 112 while covering the plate cutout portion 121, the movement of the plate cutout portion 121 in the direction opposite to the bending inlet I is fundamentally blocked. Thereby, it is possible to surely prevent the venting gas from flowing back into the battery pack 100 from the gas venting channel H through the bending inlet I. The blocking bracket includes an edge frame 131 coupled to the plate main body portion 122 and a blocking frame 133 extending in a direction crossing the edge frame 131, and the plate cutout portion 121 cannot move inside the battery pack 100 by this blocking frame 133. However, since the blocking bracket has a venting hole 132 (venting space) between the blocking frame 133 and the edge frame 131, one-way movement that allows the venting gas in the battery pack 100 to flow toward the bending inlet I is permitted.

[0074] Thus, since the battery pack 100 according to the present invention can discharge venting gas to the outside, it prevents an increase in pressure inside the pack and effectively blocks the chain reaction of thermal runaway. At the same time, the venting plate 120 and the regulating member 130 (shut-off bracket) prevent the reverse flow of venting gas into the pack, thereby preventing the high-temperature venting gas from propagating to adjacent battery cells or battery modules. As a result, the safety of the battery pack 100 of the present invention is further enhanced.

[0075] Also, as shown in FIG. 6, a venting inlet I and a gas venting channel H are formed in the side frames 112c and 112d installed horizontally. A gas venting channel communicating with the gas venting channel H and a venting outlet O are formed in the side frames 112a and 112b arranged perpendicular to the side frames 112c and 112d in which the venting inlet I is formed. In this way, the venting gas can be discharged through a longer path. This blocks the rapid discharge of the high-temperature venting gas to the outside of the pack, thereby enhancing safety. In particular, as the high-temperature and high-pressure venting gas moves through the long path, its temperature and pressure decrease, further improving the safety at the venting outlet O.

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

[0077] The venting mechanism portion 113 includes a venting cap 114 for preventing the outflow of venting gas at the venting outlet O. The venting cap 114 covers the venting outlet O and extends outward by a predetermined length to form a path for guiding the venting gas to the outside. Therefore, the venting path can be extended by the length of the venting cap 114.

[0078] A gas sealing member 115 can be installed in the bending outlet O or in the bending cap 114. The gas sealing member 115 can be, for example, a sheet-like member. The gas sealing member 115 can be deformed at a predetermined pressure and / or a predetermined temperature or higher to open the bending outlet O to the outside. For example, the gas sealing member 115 can be a rupture sheet configured to rupture when the pressure of the bending gas becomes a certain pressure or higher. Alternatively, the sheet member can open the bending outlet O while melting at a predetermined temperature or higher. For this purpose, the sheet member can be provided with a film or foam substance that is vulnerable to high temperatures.

[0079] When the bending cap 114 and the gas sealing member 115 are installed at the bending outlet O, even if a small amount of bending gas is generated inside the battery pack, the bending gas is not discharged to the outside, so the safety of the battery pack 100 can be enhanced. Also, by maintaining the airtightness inside the battery pack 100, the operating stability of the battery pack 100 can be strengthened. In this case, a small amount of bending gas that is moved to the bending inlet I through the cutting line C of the bending plate 120 can be prevented from being discharged to the outside of the battery pack 100 by the gas sealing member 115. However, in practice, it is difficult to maintain the inside of the battery pack 100 completely airtight, so an extremely small amount of bending gas can also be released to the outside of the pack through minute gaps in the pack housing 110 other than the gas sealing member 115.

[0080] In the case of the battery pack 100 including the venting cap 114 and the gas sealing member 115 shown in FIG. 7, when an abnormal heat generation phenomenon occurs in the battery cell or the battery module, a large amount of venting gas is generated, and the pressure inside the pack exceeds the set bursting pressure of the gas sealing member 115, the gas sealing member 115 bursts and the venting outlet O is opened. Alternatively, when high-temperature venting gas exceeding the heat resistance limit of the gas sealing member 115 is discharged, the gas sealing member 115 may melt and the venting outlet O may be opened.

[0081] In this case, due to the pressure of the venting gas, the plate incision part 121 moves into the venting inlet I with one side, which is the connecting part with the venting plate 120, as the support axis. Thereby, the venting inlet I is surely opened, and a large amount of venting gas is moved to the gas venting channel H through the venting inlet I and discharged to the outside of the battery pack 100 through the opened venting outlet O.

[0082] Thereby, the pressure increase per unit time in the battery pack 100 can be reduced, and it is possible to prevent thermal runaway from occurring chain-reactionly in the battery pack 100. Further, since a flame can be discharged in addition to the venting gas through the venting path, it is also possible to prevent the flame from spreading to other battery cells and modules.

[0083] At this time, the plate cutout portion 121 of the bending plate 120 can move toward the bending inlet I side, but its movement in the opposite direction is blocked by the blocking bracket. That is, the blocking bracket source-blocks the plate cutout portion 121 from moving in the direction opposite to the bending inlet I. Thereby, it is possible to reliably prevent the bending gas from flowing backward from the gas bending channel H into the battery pack 100 through the bending inlet I. In particular, the present invention can further improve the safety when the gas sealing member 115 is not destroyed even when the set pressure or temperature is reached. For example, if the gas sealing member 115 is not destroyed even when it exceeds the set pressure or temperature, the bending gas is not discharged through the bending outlet O. In this case, the pressure of the bending gas in the gas bending channel H rises and becomes greater than the internal pressure of the battery pack 100. Therefore, the bending gas in the gas bending channel H receives the pressure toward the inside of the battery pack 100 and tries to flow backward. If there is no gas backflow prevention mechanism as in the present invention, the bending gas may flow into the battery pack 100 and instantaneously propagate to a battery cell or battery module that does not cause thermal runaway, causing a chain explosion. However, since the present invention includes the bending plate 120 and the regulating member 130 and can prevent the backflow of the bending gas, such a chain explosion can be prevented or delayed. Also, if the pressure and temperature of the gas bending channel H become even higher while the backflow of the bending gas is prevented, the gas sealing member 115 may be destroyed. That is, until the gas sealing member 115 is destroyed, the inside of the battery pack 100 can be protected by the backflow prevention mechanism, and furthermore, the time until the gas sealing member 115 is destroyed can be ensured. Thereby, a time margin for the operation of the gas sealing member is ensured, and the bending reliability of the battery pack 100 can also be improved.

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

[0085] The venting plate 120 of the battery pack shown in FIGS. 2 to 5 includes one plate cutting portion 121 in the plate main body portion 122. In the present embodiment, the venting plate 120 includes plate cutting portions 121 and 121' in pairs with respect to the plate main body portion 122. That is, in the present embodiment, cutting lines C with one side open are formed on the left and right sides of the plate main body portion 122, respectively, and the plate cutting portions 121 and 121' surrounded by the cutting lines C are provided in a pair so as to be arranged in a row. In this example, the length of one plate cutting portion is smaller than that in the example of FIG. 4. Since the plate cutting portions 121 and 121' having a small length are easily elastically deformed, a cantilever movement is possible even with a smaller gas pressure, and the opening of the venting inlet I during venting can be more easily performed. Further, since the pair of plate cutting portions 121 and 121' move together inside the venting inlet I, the pressure of the venting gas can be evenly distributed to the spaces formed by the movement of the pair of plate cutting portions 121 and 121'. Further, since the pair of plate cutting portions 121 and 121' move to form open spaces respectively, the area of the open space to 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 induced into the venting inlet I.

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

[0087] In this embodiment, a plurality of gas venting channels H are formed in the side frame 112 provided in the pack housing 110 in the height direction. That is, a plurality of the 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 the gas venting channels H can be formed in two, four, or more numbers. Theoretically, the number of gas venting channels H can be formed as many as necessary in the height direction 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 a plurality of internal spaces are formed along the advancing direction of the extrusion member, and the internal space can be used as the gas venting channel H. As shown in FIGS. 2 and 3, when one large hollow is formed in the side frame 112 and used as the gas venting channel H, the discharge amount of the venting gas can be increased, but the mechanical rigidity of the side frame 112 may be insufficient.

[0089] On the other hand, as shown in FIG. 10, if a rib-shaped partition wall R is formed in the hollow space, the weight of the pack housing 110 can be reduced while increasing the mechanical rigidity of the side frame 112. Further, 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 the battery module, the venting gas can be preferably 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 respective 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 it can be seen that these venting inlets I1, I2, and I3 communicate with the gas venting channels H1, H2, and H3 respectively. In this case, in order to prevent the venting gas from flowing backward inside the battery while moving the venting gas to the respective venting inlets I1, I2, and I3, the above-described venting plate 120 and the regulating member 130 can be respectively installed on the venting inlets I1, I2, and I3 on the inner wall of the side frame 112. That is, the backflow prevention mechanism B of the present invention can also be installed in three corresponding to the number of the venting inlets I1, I2, and I3 and the 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 to simplify the device configuration. That is, the venting plate 120 and the blocking bracket 130 constituting the backflow prevention mechanism B are installed only one for each venting inlet I and gas venting channel H to reduce the device manufacturing cost. Instead, a plurality of plate cutting portions installed on the venting plate 120 are formed corresponding to the number of the venting inlets I for opening and closing the respective venting inlets I. Referring to FIGS. 10 and 11, the venting plate 120 includes one plate main body portion 122 and three plate cutting portions 121, 123, and 125 at predetermined intervals in the height direction corresponding to the number of the gas venting channels H1, H2, and H3 and the venting inlets I1, I2, and I3. That is, three cutting lines C in the shape of a figure with one side open are provided on the plate main body portion 122 in the height direction. Therefore, there are also three plate cutting portions 121, 123, and 125 surrounded by the cutting line C.

[0092] With each of the plate cutout portions 121, 123, 125 located on each of the bending inlets I1, I2, I3, the plate main body portion 122 is coupled to the side frame 112 by covering all around each bending inlet I of the inner wall of the side frame 112.

[0093] Also, only one shutoff bracket, which is the regulating member 130, is provided, and this one shutoff bracket can be coupled to the bending plate 120 while covering all of the three plate cutout portions 121, 123, 125.

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

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

[0096] As shown in Fig. 9, the bending plate 120 of this embodiment has plate cutout portions 121 formed in pairs on the left and right sides of the plate main body portion 122. Further, as shown in Figs. 10 and 11, the bending plate 120 is provided with three plate cutout portions at predetermined intervals in the height direction so as to correspond to the gas bending channel H. Therefore, in this embodiment, three pairs of plate cutout portions 121, 121', 123, 123', 125, 125' are provided in the height direction.

[0097] This bending plate 120 can also reduce the length of the plate cutout portion as in the bending plate 120 of Fig. 9, so that elastic deformation can be made easier. Further, as the number of plate cutout portions increases, as shown in Fig. 13, the opening area to each bending inlet I increases, and a large amount of bending gas can be more easily discharged into the gas bending channel H.

[0098] (Embodiment 5) Fig. 14 is a schematic view 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 housed in a pack housing.

[0100] As shown in the figure, a plurality of, for example, six battery modules M1 to M6 are housed on the base plate 211 of the pack housing 210, and the side frames 212 are coupled along the edges 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 can be housed in the module case of the battery module. For this purpose, the module case may be provided with an accommodation space for accommodating a 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 component assembly can accommodate a relay device, a current sensor, a fuse, a BMS, an MSD (Manual Service Disconnector), etc. Such an electrical component assembly can be packaged together with a battery module by a pack housing so as not to be externally exposed.

[0103] The pack housing 210 in FIG. 14 is somewhat different in form from the pack housing in FIG. 1 so as to be able to accommodate a plurality of battery modules. That is, the pack housing 210 in FIG. 14 has a center frame 214 on a base plate 211, and a partition wall (cross beam 215) is installed between the center frame 214 and a side frame 212 so that battery modules can be compartmentally installed. The side frame 212 is installed on the base plate 211 along the edge of the battery module. Also, a pack cover (not shown) covers the battery module and is installed on the upper part of the side frame 212. That is, the pack cover, the side frame 212, the base plate 211, the center frame 214, and the cross beam 215 constitute the pack housing 210 that houses the modules.

[0104] The side frame 212 has a hollow gas venting channel H inside. As shown in FIG. 14, when forming one gas venting channel H along the side frame 212, venting inlets I1, I2, I3 that communicate with this one gas venting channel H respectively can be formed for each battery module. Also, a venting outlet O that communicates with the gas venting channel H or a venting mechanism part 213 as shown in FIG. 7 can be formed on one outer wall of the side frame 212.

[0105] On each of the above venting inlets I, a venting plate 220 and a blocking bracket 230 according to the present invention are installed. In this case, as shown in FIG. 14, it is preferable that the venting inlets I and the above backflow prevention mechanisms B1, B2, and B3 are respectively installed on the inner walls of the side frames 212c and 212d on both sides of the battery module. Thereby, venting gas can be discharged from the battery modules arranged on both sides inside the battery pack to the venting inlets I1, I2, and I3 in a well-balanced manner. Further, the venting gas can be moved in a well-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] Also, it is preferable that the venting inlets I1, I2, and I3 and the backflow prevention mechanisms B1, B2, and B3 are installed on the inner wall of the side frame 212 on the side where the terminal portion of the battery module is formed. Since venting gas is likely to be generated at the module terminal portion, if the venting inlets I1, I2, and I3 are formed on the inner wall of the side frame 212 facing it, the venting gas can be more easily discharged to the outside.

[0107] Also in this embodiment, each of the backflow prevention mechanisms B1, B2, and B3 installed on the venting inlets I1, I2, and I3 can prevent the backflow into the inside of the battery module while discharging the venting gas in one direction to the venting inlets I1, I2, and I3.

[0108] Thereby, even when the pressure of the venting gas discharged from a specific 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 view showing a battery pack according to another embodiment of the present invention.

[0110] This embodiment is provided with a plurality of gas venting channels H1, H2, and H3 along the height direction of the side frame 212 as shown in FIG. 12. When the internal space of the side frame 212 is partitioned by partitions R like ribs, the internal space can be used as the plurality of gas venting channels H1, H2, and H3. Also, 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 located along the height direction can be assigned as a dedicated gas venting channel for gas venting of each battery module.

[0112] That is, as shown in FIG. 15, among the three gas venting channels H1, H2, and H3 along the height direction, the uppermost gas venting channel H1 can form a venting inlet I1 on the inner wall of the uppermost side frame 212 facing the battery module M1 so as to communicate with the battery module M1. Also, the middle gas venting channel H2 can form a venting inlet I2 in the middle part of the inner wall of the side frame 212 facing the battery module M2 so as to communicate with the battery module M2. Further, the lowermost gas venting channel H3 can form a venting inlet I3 at the lowermost end of the inner wall of the side frame 212 facing the battery module M3 so as to communicate with the battery module M3. In this way, while preventing the flow of high-temperature venting gas between adjacent battery modules in the battery pack, the venting gas generated in each battery module can be efficiently discharged to each of the venting inlets I1, I2, and I3 quickly. Also, since dedicated gas venting channels H1, H2, and H3 are formed for each module, it is difficult for the venting gas generated in one module to flow into the gas venting channels H1, H2, and H3 of other modules at the positions of the venting inlets I1, I2, and I3. Therefore, the reverse flow phenomenon of the venting gas caused by the pressure interference between the gas venting channels can be further reduced.

[0113] In addition, venting plates 120 and blocking brackets 130 can be installed at venting inlets I1, I2, and I3 respectively, which are arranged along the height direction of each of the above gas venting channels. Therefore, in this embodiment, the safety of the battery pack can be further enhanced 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 can be installed at the venting inlet I1 of the uppermost gas venting channel H1 that communicates with the battery module of M1. In addition, a separate dedicated venting plate 120' and a blocking bracket 130' can also be installed at the venting inlet I2 of the middle gas venting channel H2. Next, a separate dedicated venting plate 120'' and a blocking bracket 130'' can be installed at the venting inlet I3 that communicates with the lowermost gas venting channel H3. Thereby, when venting gas is generated, the plate cutout portions 121, 121', and 121'' move from the plate main body portions 122, 122', and 122'' of the respective venting plates 120, 120', and 120'' into the respective venting inlets I1, I2, and I3, so that the venting gas can be discharged into the respective gas venting channels H1, H2, and H3.

[0115] On the other hand, three gas venting channels H1, H2, and H3 can also be formed along the height direction in the same way on the side frame 212 facing M4, M5, and M6, which are arranged on the side opposite to M1, M2, and M3. In addition, venting inlets that communicate with each battery module and the gas venting channel H are formed on the inner wall of the facing side frame 212, and a venting plate and a blocking bracket can be installed on each venting inlet respectively.

[0116] This enables efficient discharge of venting gas from each battery module to each gas venting channel assigned to that module while preventing gas backflow from the gas venting channels to each battery module.

[0117] On the other hand, when a plurality of gas venting channels H1, H2, H3 are formed in each side frame 212 along the height direction, at the outlet end of each gas venting channel, that is, at the venting outlet O formed on the outer wall of the side frame 212, the venting gas of each gas venting channel can be converged and discharged. For this purpose, the side frame 212 can be shaped so that the plurality of gas venting channels gather near the venting outlet O.

[0118] The number of the venting outlets O can also be determined corresponding to the position where the venting inlet I is formed. For example, as shown in FIGS. 1, 6, and 14, when venting inlets I are respectively formed on the inner walls of the side frames 112c, 112d, 212c, 212d arranged on both the left and right sides of the battery cell or battery module, the venting outlets O can be respectively formed at two positions on the left and right sides on the outer walls of the side frames 112a, 212a arranged perpendicular to the side frames 112c, 112d, 212c, 212d where the venting inlets I are formed. Thereby, the venting gas can be discharged well-balancedly on both sides of the battery pack.

[0119] According to various embodiments as described above, a power storage device (not shown separately) including the battery pack with improved safety can be provided by efficiently discharging the venting gas while preventing backflow.

[0120] Also, an embodiment of the present invention can provide an automobile (not shown separately) including the battery pack with improved safety by efficiently discharging the venting gas while preventing backflow.

[0121] The above description merely exemplarily explains the technical idea of the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the drawings disclosed in the present invention are for the purpose of explanation rather than for limiting the technical idea of the present invention, and the scope of the technical idea of the present invention is not limited by such drawings. The protection scope of the present invention should be interpreted according to the scope of the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the rights of the present invention.

[0122] On the other hand, in this specification, terms indicating directions such as up, down, left, right, front, and back are used, but these terms are for convenience of explanation and it is self-evident that they can vary depending on the position of the object in question, the position of the observer, etc.

Explanation of Reference Numerals

[0123] 10: Battery cell laminate 100, 200: Battery pack 110, 210: Pack housing 111, 211: Base plate 112, 212: Side frame 113, 213: Bending mechanism part 114: Bending cap 115: Gas sealing member B, B1, B2, B3: Backflow prevention mechanism 120, 220: Bending plate 121, 121’: Plate cutting part 123, 123’: Plate cutting part 125, 125’: Plate cutting part 122: Plate main body part C: Cutting line 130, 130’, 130’’, 230: Regulation member (cut-off bracket) 131: Edge frame 132: Bending hole 133: Cut-off frame H, H1, H2, H3: Gas venting channels I, I1, I2, I3: Venting inlets R: Partition wall O: Venting outlet M1~M6: Battery modules 214: Center frame 215: Cross beam

Claims

1. A battery pack in which a plurality of battery cells or a plurality of battery modules are accommodated, including a pack housing in which a gas venting channel is formed inside, and a side frame in which a venting inlet communicating with the gas venting channel is formed at at least one location on an inner wall facing the battery cell or the battery module; a plate cutting portion surrounded by a cutting line having a figure shape with one side open, and a plate main body portion surrounding the plate cutting portion, and a venting plate coupled to an inner wall of the side frame covering the venting inlet; and a restricting member coupled to the venting plate covering the plate cutting portion inside the venting plate on the side opposite to the venting inlet, wherein the plate cutting portion is movable inside the venting inlet with one side connected to the plate main body portion as a support shaft, but movement in a direction opposite to the venting inlet is blocked by the restricting member. A battery pack.

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 the battery module.

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

4. The venting inlet is formed on an inner wall of the 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 are installed on the venting inlet. The battery pack according to claim 1.

5. The bending inlet is formed to have a predetermined length along the longitudinal direction of the side frame, and the plate cutting portion is formed to have a size that can be inserted into the bending inlet. The battery pack according to claim 1.

6. The battery pack according to claim 1, wherein the plate body portion is coupled to an inner wall of the side frame around the bending inlet with the plate cutting portion positioned on the bending inlet.

7. The battery pack according to claim 6, wherein the restricting member is a blocking bracket including a bending hole and a blocking frame that blocks movement of the plate cutting portion at a portion facing the plate cutting portion.

8. The battery pack according to claim 7, wherein an edge portion of the blocking bracket and the plate body portion are both fastened to an inner wall of the side frame around the bending inlet by a fastening member.

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

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

11. The battery pack according to claim 9, further including a bending cap that covers the bending outlet and extends to the outside.

12. The battery pack according to claim 11, further including a gas sealing member installed in the bending outlet or the bending cap, which is deformed at a predetermined pressure and / or a predetermined temperature or higher to open the bending outlet to the outside.

13. The battery pack according to claim 1, wherein the plate cutting portion is formed in pairs with the plate body portion.

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

15. The bending plate includes one plate main body portion and a plurality of the plate cutout portions formed at predetermined intervals in the height direction so as to correspond to the gas venting channels, with the plate main body portion covering all around each of the bending inlets of the inner wall of the side frame and being coupled to the side frame in a state where each of the plate cutout portions is positioned on each bending inlet, and one restricting member covers the plate cutout portion and is coupled to the bending plate. The battery pack according to claim 14.

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

17. An automobile including the battery pack according to any one of claims 1 to 15.

Images