Battery pack and automobile including same

Abstract

A battery pack according to an embodiment of the present invention includes a plurality of battery modules each having a plurality of stacked battery cells, a pack case for accommodating the plurality of battery modules, and a blocking cover for covering at least a portion of the battery modules so as to be opened in a predetermined direction by a flame or gas.

Description

[Technical Field]

[0001] The present invention relates to a battery pack and a vehicle including the same, and more particularly to a battery pack capable of preventing the propagation of flames or gases and a vehicle including the same.

[0002] This application claims priority based on Korean Patent Application No. 10-2023-0090610, filed on July 12, 2023, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings thereof. [Background technology]

[0003] As technological development and demand for mobile devices increases, the demand for secondary batteries as an energy source is rapidly increasing. Conventional secondary batteries were nickel-cadmium batteries or hydrogen-ion batteries, but recently lithium secondary batteries have become popular because they have almost no memory effect compared to nickel-based secondary batteries, can be charged and discharged freely, have a very low self-discharge rate, and have a high energy density.

[0004] Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as the positive and negative electrode active materials, respectively, and include an electrode assembly in which a positive electrode plate and a negative electrode plate, each coated with the positive and negative electrode active materials, are arranged with a separator sandwiched therebetween, and an exterior material, i.e., a battery case, that hermetically houses the electrode assembly together with an electrolyte.

[0005] Lithium secondary batteries consist of a positive electrode, a negative electrode, a separator, and an electrolyte interposed between them, and are classified as lithium ion batteries (LIBs), polymer lithium ion batteries (PLIBs), etc. depending on the positive and negative electrode active materials used. Typically, the electrodes of these lithium secondary batteries are formed by applying a positive or negative electrode active material to a current collector such as an aluminum or copper sheet, mesh, film, or foil, followed by drying.

[0006] Lithium secondary batteries have been attracting attention due to their advantages such as high operating voltage and much higher energy density. However, because they use organic electrolytes, they have the problem that if they are overcharged, they can cause overcurrent and overheating, which can lead to explosions or fires.

[0007] Various types of secondary batteries include a battery module having a case capable of protecting the battery cells, in which a plurality of battery cells are stacked and housed in the case, and a battery pack housing a plurality of battery modules.

[0008] Here, if a flame occurs in at least one of the battery cells inside the battery module case, if the flame escapes to the outside of the battery module case, it may not only spread to other battery modules but also create a dangerous situation for the user.

[0009] For example, if a flame occurs in a battery cell when the battery module or battery pack is installed in an electric vehicle and the flame escapes to the outside, the driver of the electric vehicle may be burned or placed in a dangerous situation.

[0010] Alternatively, if a fire generated in one battery module spreads to an adjacent battery module, a chain reaction of the flames may cause the battery module or battery pack to be damaged, burned down, or explode, resulting in a problem that the safety of the battery module or battery pack cannot be ensured. Furthermore, if gas is generated from the battery cells inside the battery module and this gas is discharged in an undesired direction, various other problems may occur. Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention aims to provide a battery pack and a vehicle including the same that can prevent the spread of flames or gases generated in a battery module that has ignited in a battery cell inside the battery module from spreading to adjacent battery modules by discharging the flames or gases in a predetermined direction, thereby ensuring the safety of the battery modules. [Means for solving the problem]

[0012] According to one aspect of the present invention, a battery pack may be provided that includes a plurality of battery modules each having a plurality of stacked battery cells, a pack case in which the plurality of battery modules are housed, and a blocking cover that covers at least a portion of the battery module and is opened in a predetermined direction by flame or gas.

[0013] In one embodiment, the pack case includes a lower frame on which the plurality of battery modules are mounted, side frames extending upward from edges of the lower frame, an inner frame extending upward from inside the lower frame and coupled to the side frames, a partition frame coupled to the inner frame and interposed between the plurality of battery modules, and an upper frame spaced apart from the inner frame and coupled to the side frames, and the shielding cover may be provided on the partition frame.

[0014] In one embodiment, the shielding cover may include a first shielding portion located at an upper portion and a second shielding portion bent and extending from the first shielding portion.

[0015] In one embodiment, the second blocking portion may be spaced apart from the inner frame.

[0016] In one embodiment, a protrusion is formed on the upper portion of the partition frame, a groove is formed in the first blocking portion of the blocking cover, and the groove portion of the first blocking portion can be detachably sandwiched between the protrusion of the partition frame.

[0017] In one embodiment, the blocking cover can be rotated and opened between the upper frame and the inner frame as the groove portion of the first blocking portion is separated from the protrusion portion of the partition frame by the flame or the gas.

[0018] In one embodiment, the shielding cover may be formed in an L-shape.

[0019] In one embodiment, the first blocking portion may include a center portion covering the battery module, and wing portions located on both side edges of the center portion and separated from the center portion.

[0020] In one embodiment, when the flame or the gas occurs, the center portion of the first blocking portion may be opened upward by the flame or the gas.

[0021] In one embodiment, the first blocking portion and the second blocking portion may be integrally formed, and an incision may be formed between the center portion of the first blocking portion and the wing portion.

[0022] In one embodiment, the barrier cover may be made from mica.

[0023] In one embodiment, the battery module may include a flame / gas guiding channel member coupled to the battery module to guide the flame or gas discharged in a predetermined direction when the blocking cover is opened.

[0024] In one embodiment, the interior of the flame gas guiding channel member is hollow, and the flame or the gas can be discharged through the hollow interior of the flame gas guiding channel member.

[0025] In one embodiment, the inside of the side frame is hollow, and the flame gas guiding channel member is connected to the side frame, so that the flame or the gas can move from the flame gas guiding channel member to the side frame and be discharged.

[0026] According to another aspect of the present invention, there is provided a vehicle including the above-described battery pack. [Effects of the Invention]

[0027] In an embodiment of the present invention, when a battery cell inside any one battery module ignites, the flame or gas generated in the battery module can be discharged in a predetermined direction to prevent the flame or gas from spreading to an adjacent battery module.

[0028] Furthermore, the safety of the battery module can be ensured.

[0029] Also, assembly is easy and costs can be reduced by eliminating fastening members. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a partially exploded perspective view of a battery pack according to a first embodiment of the present invention. FIG. [Figure 2] 2 is a cross-sectional view of a battery module included in the battery pack of FIG. 1. [Figure 3] FIG. 2 is an enlarged view of part A in FIG. [Figure 4] 1 is a partial plan view of a battery pack according to a first embodiment of the present invention. [Figure 5] 3 is a view showing a state in which a battery module is separated from a shielding cover in the battery pack according to the first embodiment of the present invention. FIG. [Figure 6] 3 is a view showing the inside of the blocking cover in the battery pack according to the first embodiment of the present invention. FIG. [Figure 7] 1 is a perspective view of a blocking cover of a battery pack according to a first embodiment of the present invention. FIG. [Figure 8] 4A to 4C are views illustrating a process in which a blocking cover is opened by a flame or gas in a battery pack according to a first embodiment of the present invention, and the flame or gas is discharged. [Figure 9] 4A to 4C are views illustrating a process in which a blocking cover is opened by a flame or gas in a battery pack according to a first embodiment of the present invention, and the flame or gas is discharged. [Figure 10] 10 is a view showing a blocking cover and a battery module of a battery pack according to a second embodiment of the present invention, including a partially enlarged view. [Figure 11] FIG. 10 is a perspective view of a blocking cover of a battery pack according to a second embodiment of the present invention. [Figure 12] 10A to 10C are views illustrating a process in which a blocking cover is opened by a flame or gas in a battery pack according to a second embodiment of the present invention, and the flame or gas is discharged. [Figure 13] 10A and 10B are views illustrating a process in which a blocking cover is opened by a flame or gas in a battery pack according to a third embodiment of the present invention, and the flame or gas is discharged. [Figure 14] 1 is a diagram illustrating a vehicle including a battery pack according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in this specification and claims should not be construed as being limited to their ordinary or dictionary meanings, but should be construed as meanings and concepts corresponding to the technical ideas of the present invention, in accordance with the principle that the inventor himself can appropriately define the concepts of terms in order to best explain the invention. Therefore, it should be understood that the embodiment described in this specification and the configurations shown in the drawings are merely the most preferred embodiment of the present invention and do not represent the entire technical ideas of the present invention, and therefore, various equivalents and modifications that can be substituted therefor may exist at the time of filing this application.

[0032] As used herein, the terms "coupled" or "connected" include not only cases where one member is directly coupled or connected to another member, but also cases where one member is indirectly coupled or connected to another member via a joint member.

[0033] Fig. 1 is a partially exploded perspective view of a battery pack according to a first embodiment of the present invention, Fig. 2 is a cross-sectional view of a battery module included in the battery pack of Fig. 1, and Fig. 3 is an enlarged view of portion A of Fig. 1. Fig. 4 is a partial plan view of a battery pack according to the first embodiment of the present invention, Fig. 5 is a view showing a battery module separated from a shielding cover in the battery pack according to the first embodiment of the present invention, Fig. 6 is a view showing the inside of the shielding cover in the battery pack according to the first embodiment of the present invention, and Fig. 7 is a perspective view of the shielding cover of the battery pack according to the first embodiment of the present invention. Figs. 8 and 9 are views showing a process in which the shielding cover is opened by flame or gas in the battery pack according to the first embodiment of the present invention, allowing the flame or gas to be discharged.

[0034] Referring to FIG. 1, a battery pack 10 according to a first embodiment of the present invention may include a plurality of battery modules 100, a pack case 200, and a shielding cover 300.

[0035] A plurality of battery modules 100 may be provided and arranged in various ways, for example, horizontally and vertically as shown in FIG. 1, but the arrangement is not limited thereto.

[0036] Referring to FIG. 2 , the battery module 100 may include a plurality of battery cells 110 and a module case 120 .

[0037] A plurality of battery cells 110 may be stacked on one another. The battery cells 110 may have various structures, and the plurality of battery cells 110 may be stacked in various ways.

[0038] The battery cell 110 may have a structure in which a plurality of unit cells arranged in the order of positive electrode plate / separator / negative electrode or bi-cells arranged in the order of positive electrode plate / separator / negative electrode plate / separator / positive electrode plate / separator / negative electrode are stacked according to the battery capacity.

[0039] The battery cell 110 may be provided with electrode leads. The electrode leads are a type of terminal exposed to the outside and connected to an external device, and may be made of a conductive material. The electrode leads may include a positive electrode lead and a negative electrode lead.

[0040] The positive electrode lead and the negative electrode lead may be arranged in opposite directions along the longitudinal direction of the battery cell 110, or the positive electrode lead and the negative electrode lead may be positioned in the same direction as each other relative to the longitudinal direction of the battery cell 110.

[0041] The battery cell 110 may be provided with a plurality of cartridges (not shown) that house the battery cells 110. Each cartridge (not shown) can be manufactured by plastic injection molding, and a plurality of cartridges (not shown), each having a housing formed therein for housing the battery cells 110, may be stacked. A cartridge assembly in which a plurality of cartridges (not shown) are stacked may be provided with a connector element or a terminal element.

[0042] The connector element may include various types of electrical connection parts or connection members for connecting to, for example, a BMS (Battery Management System, not shown) that provides data related to the voltage or temperature of the battery cell 110.

[0043] The terminal elements include a positive terminal and a negative terminal as main terminals connected to the battery cell 110. The terminal elements may be provided with terminal bolts and may be electrically connected to the outside. Meanwhile, the battery cell 110 may have various shapes.

[0044] 2, a plurality of battery cells 110 are stacked and housed in a module case 120. The module case 120 surrounds the plurality of battery cells 110, thereby protecting the battery cells 110 from external vibrations or impacts.

[0045] The module case 120 may be formed in a shape corresponding to the shape of a stack of the plurality of battery cells 110. For example, if the stack of the plurality of battery cells 110 is formed in a hexahedron shape, the module case 120 may also be formed in a corresponding hexahedron shape. However, the present invention is not limited thereto. Here, the module case 120 may include an upper module case, a lower module case, and a side module case.

[0046] Furthermore, the module case 120 can be manufactured by, for example, bending a metal plate, thereby allowing the module case 120 to be manufactured as a single unit. When the module case 120 is manufactured as a single unit, the joining process becomes simple and easy. Alternatively, the module case 120 can be provided as separate units and joined by welding or the like. However, the material of the module case 120 is not limited to metal.

[0047] 1 , a plurality of battery modules 100 are housed in a pack case 200. The pack case 200 may include, for example, a lower frame 210, a side frame 220, an inner frame 230, a partition frame 240, and an upper frame 250.

[0048] The lower frame 210 is configured to mount a plurality of battery modules 100. The lower frame 210 may be formed in the shape of a square plate, but is not limited thereto. The lower frame 210 forms the bottom of the pack case 200.

[0049] The side frames 220 may be configured to extend upward from edges of the lower frame 210. The side frames 220 define the height of the pack case 200 and form a predetermined space between them and the lower frame 210. A plurality of battery modules 100 are mounted in the space between the side frames 220 and the lower frame 210. The side frames 220 may include long side frames 220a having a relatively long length and short side frames 220b having a relatively short length.

[0050] The inner frame 230 extends upward inside the lower frame 210 and is coupled to the side frame 220. One or more inner frames 230 may be provided, and the plurality of battery modules 100 may be arranged to face each other with respect to the inner frame 230. The inner frame 230 is arranged in the same direction as the short side frame 220b.

[0051] The partition frame 240 is coupled to the inner frame 230. Here, the partition frame 240 is arranged in the same direction as the long side frame 220a. The partition frame 240 is interposed between the plurality of battery modules 100. In FIG. 1, one partition frame 240 is arranged between two adjacent battery modules 100, but this is not limiting. Here, referring to FIGS. 1 and 3, a blocking cover 300 is provided on the partition frame 240.

[0052] The upper frame 250 is spaced apart from the inner frame 230 and coupled to the side frame 220. Referring to Fig. 8, a predetermined gap is formed between the upper frame 250 and the inner frame 230. A predetermined gap is also formed between the upper frame 250 and the partition wall frame 240. As will be described in detail later, gas can be discharged through this gap between the upper frame 250 and the partition wall frame 240.

[0053] The shielding cover 300 covers at least a portion of the battery module 100 so as to be opened in a predetermined direction by a flame or gas. When the shielding cover 300 is opened by a flame or gas, the flame or gas can be discharged in a predetermined direction through the open space of the shielding cover 300.

[0054] 3 to 5, the shielding cover 300 is attached to the partition frame 240. Here, the shielding cover 300 is attached to the partition frame 240 without any fastening members. As will be described later, the protrusions 241 of the partition frame 240 are detachably sandwiched in the grooves 311 of the first shielding parts 310 of the shielding cover 300 without any fastening members, which facilitates assembly and reduces costs.

[0055] 6 and 7, the blocking cover 300 may include a first blocking portion 310 and a second blocking portion 320. The first blocking portion 310 is located above the second blocking portion 320 and covers at least a portion of the battery module 100 as shown in FIG. 3. Here, the blocking cover 300 is located above the bus bars, and a fireproof cover (not shown) that blocks the bus bars may be provided below the blocking cover 300.

[0056] The second blocking portion 320 is bent and extends from the first blocking portion 310. The second blocking portion 320 may be bent at a 90° angle from the first blocking portion 310 and disposed between the inner frame 230 and the battery module 100. Referring to FIG. 8 , in this case, the second blocking portion 320 is positioned apart from the inner frame 230. Meanwhile, the 90° bending angle between the second blocking portion 320 and the first blocking portion 310 is merely an embodiment and is not limited thereto.

[0057] 1 and 8, a protrusion 241 is formed on the upper portion of the partition frame 240. And, referring to Fig. 7, a groove 311 is formed in the first blocking portion 310 of the blocking cover 300. And, as shown in Fig. 3, the protrusion 241 of the partition frame 240 is separably sandwiched in the groove 311 of the first blocking portion 310.

[0058] 9, the flame or gas may cause the shielding cover 300 to rotate upward, causing the groove 311 of the first shielding part 310 to separate from the protrusion 241 of the partition frame 240. That is, when the groove 311 of the first shielding part 310 separates from the protrusion 241 of the partition frame 240, the shielding cover 300 may rotate and open between the upper frame 250 and the inner frame 230, and the flame or gas may be discharged through the open gap of the shielding cover 300 between the upper frame 250 and the partition frame 240 (see arrows in FIG. 9).

[0059] As described above, referring to FIG. 8, the second blocking portion 320 is positioned away from the inner frame 230, and the first blocking portion 310 is positioned away from the upper frame 250, so that the blocking cover 300 can be rotated between the upper frame 250 and the inner frame 230 by flames or gases.

[0060] That is, when the shielding cover 300 rotates due to flames or gas, the upper frame 250 and the inner frame 230 function as a kind of stopper, so that the shielding cover 300 can rotate only within a predetermined range. Explaining this with reference to Fig. 9, when the shielding cover 300 rotates, the first shielding part 310 hits the upper frame 250, and the second shielding part 320 hits the inner frame 230, so that the shielding cover 300 cannot rotate any further, and therefore the shielding cover 300 can rotate only within a predetermined range.

[0061] 1 and 9, when the blocking cover 300 is opened by a flame or gas as described above, the direction of the opened gap of the blocking cover 300 is the direction in which the battery module 100 in which the flame or gas is generated is located.

[0062] That is, for example, if a flame or gas occurs in a first battery module 100a (see FIG. 1), which is one of the battery modules 100, the open gap of the blocking cover 300 faces the first battery module 100a, so the flame or gas generated in the first battery module 100a is discharged only to the first battery module 100a and is not discharged to other battery modules 100 in which no flame is occurring.

[0063] This has the effect of preventing the flame or gas generated in a battery module 100 that ignites in a battery cell 110 inside any one of the battery modules 100 from spreading to adjacent battery modules 100 by discharging the flame or gas in a predetermined direction (toward the battery module where the flame or gas was generated).

[0064] Meanwhile, the blocking cover 300 may be formed in various shapes, for example, an L-shape as shown in Fig. 8, but the shape of the blocking cover 300 is not limited thereto.

[0065] The insulating cover 300 may be made of a variety of materials, for example, mica, which is a fire-resistant material, but the material of the insulating cover 300 is not limited thereto.

[0066] Fig. 10 is a diagram showing a blocking cover and a battery module in a battery pack according to a second embodiment of the present invention, including a partially enlarged view, Fig. 11 is a perspective view of the blocking cover of the battery pack according to the second embodiment of the present invention, and Fig. 12 is a diagram showing a process in which the blocking cover is opened by flame or gas in the battery pack according to the second embodiment of the present invention and the flame or gas is discharged.

[0067] The second embodiment of the present invention differs in structure from the first embodiment in that a portion of the first blocking unit 310 is separated, in that the first blocking unit 310 is not separated. The same content as that described in the first embodiment will be substituted for the description of the first embodiment. Furthermore, the content of the second embodiment that is applicable to the first embodiment can also be applied to the first embodiment.

[0068] 10 and 11, the first blocking portion 310 may include a center portion 312 and wing portions 313. The center portion 312 is located at the center of the battery module 100. Here, the "center" may be understood as a concept that includes not only the exact center but also a position close to the center. The wing portions 313 are located on both side ends of the center portion 312 and are separated from the center portion 312.

[0069] 10, a gap is formed by cutting between center portion 312 and wing portions 313, thereby separating center portion 312 and wing portions 313. That is, cutout portion 314 is formed between center portion 312 and wing portions 313 of first blocking portion 310. In this case, first blocking portion 310 and second blocking portion 320 are formed as an integral unit. That is, only center portion 312 and wing portions 313 of first blocking portion 310 are separated from each other.

[0070] 10 and 11, two wing portions 313a, 313b are provided, one on the inside and one on the outside, and the inner wing portions 313a of the two first blocking portions 310a, 310b are stacked on top of each other and attached to the protrusion portion 241 of the partition frame 240.

[0071] If a fire or gas occurs in the battery module 100, the center 312 of the first blocking part 310 is opened upward by the fire or gas, as shown in FIG. 12. That is, while the first blocking part 310 rotates as a whole to open in the first embodiment, in the second embodiment, only the center 312 of the first blocking part 310 is deformed to open. At this time, the wing parts 313 of the first blocking part 310 are connected to the protrusions 241 of the partition frame 240. That is, the wing parts 313 maintain their original positions, while the center part 312 is raised upward by the cutouts 314, changing its shape. The fire or gas is then exhausted through the open gap of the center part 312 between the upper frame 250 and the partition frame 240 (see the arrow in FIG. 12).

[0072] FIG. 13 is a view illustrating a process in which the blocking cover is opened by a flame or gas in the battery pack according to the third embodiment of the present invention and the flame or gas is discharged.

[0073] The third embodiment of the present invention differs from the first or second embodiment in terms of configuration in that it includes a flame gas guide channel member 400. However, for the content common to the first or second embodiment, the description of the first or second embodiment will be substituted. In addition, among the content described in the third embodiment, the content applicable to the first or second embodiment can also be applied to the first or second embodiment.

[0074] 13, the flame and gas guiding channel member 400 is coupled to the battery module 100 so as to guide the flame or gas discharged in a predetermined direction when the blocking cover 300 is opened. Referring to FIG. 13, the interior of the flame and gas guiding channel member 400 is hollow. When a flame or gas occurs in any one of the battery modules 100, the flame or gas is discharged through the cavity 410 inside the flame and gas guiding channel member 400.

[0075] For this purpose, the flame and gas guiding channel member 400 may be installed adjacent to the first blocking portion 310 of the blocking cover 300. That is, when the first blocking portion 310 is opened and flame or gas is discharged through the open gap of the first blocking portion 310, the flame or gas moves to the flame and gas guiding channel member 400 installed adjacent to the first blocking portion 310 and is discharged through the cavity 410 inside the flame and gas guiding channel member 400 (see arrow in FIG. 13). This allows the flame or gas to be discharged accurately in a predetermined direction.

[0076] In FIG. 13, the flame gas guiding channel member 400 is provided for the second embodiment, but the flame gas guiding channel member 400 can also be provided for the first embodiment.

[0077] Meanwhile, in a modified embodiment (not shown), the inside of the side frame 220 may be hollow. The flame and gas guiding channel member 400 communicates with the side frame 220, and flame or gas can move from the flame and gas guiding channel member 400 into the inside of the side frame 220 and be discharged.

[0078] Alternatively, the interior of at least one of the lower frame 210, side frame 220, inner frame 230, partition frame 240, and upper frame 250 of the pack case 200 may be hollow and may be used as a flow path for flame or gas movement by communicating with the flame and gas guide channel member 400.

[0079] FIG. 14 is a diagram illustrating a vehicle including a battery pack according to each embodiment of the present invention.

[0080] 14, an automobile 20 according to an embodiment of the present invention may include one or more battery packs 10 according to the above-described embodiments. Here, the automobile 20 includes various types of automobiles that use electricity, such as an electric vehicle or a hybrid vehicle.

[0081] Although terms indicating directions such as up, down, left, right, front, and rear are used in this specification, it will be obvious to those skilled in the art that these terms indicate relative positions and are used only for convenience of explanation, and may vary depending on the position of the object in question, the position of the observer, etc.

[0082] Although the present invention has been described above with reference to limited embodiments and drawings, it is to be understood that the present invention is not limited thereby, and that various modifications and variations may be made by those skilled in the art within the spirit of the present invention and the equivalent scope of the following claims. Therefore, the above-described embodiments should be considered from an illustrative rather than a restrictive perspective. In other words, the true spirit of the present invention is defined in the claims, and all differences within the equivalent scope should be construed as being included in the present invention. [Industrial Applicability]

[0083] The present invention relates to a battery pack and an automobile including the same, and is particularly applicable to the secondary battery-related industry. [Explanation of symbols]

[0084] 10 Battery Pack 20. Automobiles 90 First Interrupter 100 Battery Module 100a First Battery Module 110 battery cells 120 module case 200 pack case 210 Lower Frame 220 Side Frame 220a long side frame 220b short side frame 230 Inner Frame 240 Bulkhead Frame 241 Protrusion 250 upper frame 300 Blocking Cover 310, 310a, 310b First interrupter 311 Groove 312 Center 313, 313a, 313b Habe 314 Incision 320 Second Interceptor 400 Flame and gas guide channel members 410 Cavity

Claims

1. a plurality of battery modules each including a plurality of stacked battery cells; a pack case that houses the plurality of battery modules; a blocking cover that covers at least a portion of the battery module so as to be opened in a predetermined direction by a flame or gas.

2. The pack case is a lower frame on which the plurality of battery modules are mounted; side frames extending upward from edges of the lower frame; an inner frame extending upward from an interior of the lower frame and coupled to the side frame; a partition frame coupled to the inner frame and interposed between the plurality of battery modules; an upper frame spaced apart from the inner frame and coupled to the side frame; The battery pack according to claim 1 , wherein the blocking cover is provided on the partition frame.

3. The blocking cover is a first blocking portion located at an upper portion; The battery pack according to claim 2 , further comprising: a second cutoff portion bent and extending from the first cutoff portion.

4. The battery pack according to claim 3, wherein the second cutoff part is spaced apart from the inner frame.

5. A protrusion is formed on the upper portion of the partition frame, A groove is formed in the first blocking portion of the blocking cover, The battery pack according to claim 4 , wherein the groove of the first cutoff part is separably sandwiched between the protrusion of the partition frame.

6. 6. The battery pack of claim 5, wherein the blocking cover is rotated between the upper frame and the inner frame to be opened as the groove of the first blocking part is separated from the protrusion of the partition frame by the flame or the gas.

7. The battery pack according to claim 3, wherein the blocking cover is formed in an L-shape.

8. The first blocking unit is a center portion covering the battery module; The battery pack according to claim 3 , further comprising: wings located at both ends of the center portion and separated from the center portion.

9. The battery pack according to claim 8 , wherein the center portion of the first blocking part is opened upward by the flame or the gas when the flame or the gas is generated.

10. The first blocking portion and the second blocking portion are integrally formed, The battery pack according to claim 8 , wherein an incision is formed between the center portion of the first cutoff portion and the wing portion.

11. The battery pack according to claim 1 , wherein the blocking cover is made of mica.

12. 3. The battery pack according to claim 2, further comprising a flame / gas guiding channel member coupled to the battery module so as to guide the flame or gas discharged in a predetermined direction when the blocking cover is opened.

13. The battery pack according to claim 12, wherein the interior of the flame and gas guiding channel member is hollow, and the flame or the gas is discharged through the hollow interior of the flame and gas guiding channel member.

14. The inside of the side frame is hollow, The battery pack according to claim 13, wherein the flame and gas guiding channel member is in communication with the side frame, and the flame or the gas moves from the flame and gas guiding channel member to the side frame and is discharged.

15. A motor vehicle comprising a battery pack according to any one of claims 1 to 14.

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