Battery modules, battery packs containing them, and automobiles

Abstract

A battery module, a battery pack including the same, and an automobile are disclosed. A battery module according to one embodiment of the present invention includes a battery cell stack in which a plurality of battery cells are stacked, a module case in which the battery cell stack is housed and which has a discharge hole formed therein for discharging gas, and a reverse inflow prevention member coupled to the module case for preventing discharges generated from the battery cells from flowing out of the module case and then flowing back into the module case.

Description

Technical Field

[0001] The present invention relates to a battery module, a battery pack including the same, and a vehicle, and more particularly, to a battery module capable of preventing reverse inflow or propagation of high-temperature discharge products, a battery pack including the same, and a vehicle. This application claims priority based on Korean Patent Application No. 10-2024-0027465 filed on February 26, 2024, and all of the content disclosed in the specification and drawings of the application is incorporated into this application.

Background Art

[0002] Generally, a secondary battery refers to a battery that can be repeatedly charged and discharged, such as a lithium-ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel metal hydride battery, or a nickel zinc battery. A battery cell, which is the most basic secondary battery, can provide an output voltage of about 2.5V to 4.2V.

[0003] Recently, as such battery cells are applied to devices that require a high output voltage and a large charging capacity, such as electric vehicles and energy storage systems (ESS), a battery module configured by connecting a plurality of battery cells in series, in parallel, or in a combination of series and parallel, and a battery pack configured by further connecting such battery modules in series, in parallel, or in a combination of series and parallel are widely used.

[0004] Lithium secondary batteries have been in the spotlight due to advantages such as a high operating voltage and a much higher energy density. However, since an organic electrolyte is used, when a lithium secondary battery is overcharged, it induces overcurrent and overheating, and ultimately causes a fire due to explosion or ignition.

[0005] Figure 1 is a perspective view of a conventional battery module, and Figure 2 is a cross-sectional view of a battery pack including the conventional battery module shown in Figure 1.

[0006] Referring to Figures 1 and 2, if a thermal event such as flame generation occurs in any one of the battery cells 3 housed in the battery module 1, a high-temperature ejection may be discharged to the outside of the module case 2 of the battery module 1.

[0007] However, the high-temperature discharged material may move in various directions inside the pack case 4 of the battery pack 5 (see arrows in Figure 2) and either flow back into the module case 2 from other outlets where the thermal event occurred, or flow into other battery modules 1 where no thermal event has occurred.

[0008] Thus, when a thermal event occurs, the high-temperature discharged material from battery module 1 diffuses inside pack case 4 and can propagate to battery module 1 where no thermal event has occurred, potentially causing a thermal runaway phenomenon. If such a thermal runaway phenomenon causes flames to escape to the outside, there is a problem that the driver of the electric vehicle may be burned or put in a dangerous situation.

[0009] Alternatively, there is a problem in that the battery module 1 or battery pack 5 may be damaged or completely burned by a chain reaction of flames caused by flame propagation, making it difficult to ensure the safety of the battery module 1 or battery pack 5.

[0010] Furthermore, there is a problem in that the gas generated inside the battery module 1 is not released, causing the internal pressure to increase, which increases the likelihood of the battery module 1 or the battery pack 5 exploding. [Overview of the project] [Problems that the invention aims to solve]

[0011] Therefore, the present invention aims to provide a battery module, a battery pack including the same, and an automobile that can prevent high-temperature discharge generated and ejected by a flame from flowing back into the battery module and prevent the aforementioned high-temperature discharge from being transferred or propagated to other battery modules.

[0012] Another objective is to provide a battery module, a battery pack containing the same, and an automobile, in which high-temperature discharges are blocked but gases can be discharged in a predetermined direction.

[0013] Another objective is to provide a battery module capable of suppressing upward venting of the battery module, a battery pack including the same, and an automobile.

[0014] Another objective is to provide a battery module capable of preventing thermal runaway phenomena by preventing a chain reaction of flames caused by flame propagation, a battery pack including the same, and an automobile.

[0015] However, the technical problems that this invention aims to solve are not limited to those described above, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention below. [Means for solving the problem]

[0016] According to one aspect of the present invention, a battery module may be provided that includes a battery cell stack in which a plurality of battery cells are stacked, a module case in which the battery cell stack is housed and which has a discharge hole formed therein for discharging gas, and a backflow prevention member coupled to the module case which prevents discharges generated from the battery cells from flowing out of the module case and then flowing back into the module case.

[0017] In one embodiment, the backflow prevention member may have a movable hole that communicates with the discharge hole, and an inclined portion may be formed to prevent the backflow of the discharged material that has moved through the movable hole.

[0018] In one embodiment, the inclined portion may be formed to be located above at least a portion of the movable hole.

[0019] In one embodiment, the inclination angle of the inclined portion may be formed such that the discharged material, having moved through the moving hole, strikes the inclined portion and is reflected in a direction different from the direction in which the moving hole is located.

[0020] In one embodiment, the module case includes an upper case, the discharge hole is formed in the upper case, and the backflow prevention member can be coupled to the upper case.

[0021] In one embodiment, the backflow prevention member can be connected to the upper case by screws, bolts, or pins.

[0022] In one embodiment, the backflow prevention member includes a lower surface portion having a movable hole communicating with the discharge hole, a side surface portion connected to the lower surface portion, and an upper surface portion connected to the side surface portion and spaced apart from the lower surface portion to form a space between them, and the inclined portion may be connected to the lower surface portion and the upper surface portion respectively and formed to be inclined from the lower surface portion toward the upper surface portion.

[0023] In one embodiment, the inclined portion can connect the side portion and the top portion of the movable hole.

[0024] In one embodiment, the backflow prevention member may be opened at least one of its front and rear ends to allow gas to move.

[0025] Furthermore, according to one aspect of the present invention, a battery pack may be provided that includes the aforementioned plurality of battery modules and a pack case in which the plurality of battery modules are housed.

[0026] In one embodiment, the pack case includes an upper frame, and the backflow prevention member may contact the inside of the upper frame.

[0027] In one embodiment, a moving hole communicating with the discharge hole is formed in the backflow prevention member, and an inclined portion for preventing the backflow of the discharged material that has moved through the moving hole is formed. The first inclined portion of the first backflow prevention member of the first battery module and the second inclined portion of the second backflow prevention member of the second battery module adjacent to the first battery module among the plurality of battery modules may be formed in opposite directions to each other.

[0028] In one embodiment, a vent portion may be formed in the pack case.

[0029] In one embodiment, the vent portion may include a vent hole through which gas generated from the battery cell is discharged, and a vent valve that closes the vent hole and is opened when the internal pressure of the pack case exceeds a preset value.

[0030] In one embodiment, the gas discharged from the discharge hole may be discharged from the vent portion.

[0031] According to another aspect of the present invention, an automobile including at least one of the aforementioned battery modules may be provided.

Effects of the Invention

[0032] Embodiments of the present invention can prevent high-temperature discharged material generated and discharged by a flame from flowing back into the battery module, and can prevent the aforementioned high-temperature discharged material from transferring or spreading to other battery modules.

[0033] Also, although the high-temperature discharged material is blocked, the gas can be discharged in a preset direction.

[0034] Furthermore, it can suppress upward venting of the battery module.

[0035] Furthermore, it can prevent thermal runaway phenomena by preventing a chain reaction of flames caused by flame propagation.

[0036] However, the effects of the present invention are not limited to those described above, and other effects of the present invention not mentioned will be clearly understood by those skilled in the art from the following description of the invention.

[0037] The following drawings accompanying this specification illustrate preferred embodiments of the invention and, together with the detailed description of the invention, serve to further illustrate the technical idea of ​​the invention. Therefore, the invention should not be construed as being limited solely to what is shown in the drawings. [Brief explanation of the drawing]

[0038] [Figure 1] This is a perspective view of a conventional battery module. [Figure 2] Figure 1 is a cross-sectional view of a battery pack including a conventional battery module. [Figure 3] This is a perspective view of a battery module coupling according to one embodiment of the present invention. [Figure 4] Figure 3 shows the reverse inflow prevention member separated from the module case. [Figure 5] This is a front view of a battery module according to one embodiment of the present invention. [Figure 6] This is a perspective view showing the bottom surface of the reverse current prevention member in a battery module according to one embodiment of the present invention. [Figure 7] This figure shows a partially cut section of the backflow prevention member shown in Figure 3. [Figure 8] This is an enlarged view of section A in Figure 7. [Figure 9] This is a cross-sectional view of a battery pack according to one embodiment of the present invention. [Figure 10]This diagram shows the vent portion of a battery pack according to one embodiment of the present invention. [Figure 11] This is a diagram illustrating an automobile including a battery pack according to each embodiment of the present invention. [Modes for carrying out the invention]

[0039] Preferred embodiments of the present invention will now be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and in the claims should not be interpreted in a manner limited to their ordinary or dictionary meanings, but rather in a manner consistent with the technical idea of ​​the present invention, in accordance with the principle that the inventor himself may appropriately define the concepts of terms in order to best describe the invention. Accordingly, it should be understood that the embodiments described herein and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entirety of the technical idea of ​​the present invention, and that there may be a variety of equivalents and modifications that can be substituted therein at the time of this application.

[0040] The size of each component or specific part of a component in the drawings may be exaggerated, omitted, or shown schematically for the sake of clarity and ease of explanation. Therefore, the size of each component may not fully reflect its actual size. Specific descriptions of known functions or configurations related to the present invention will be omitted if they are deemed to unnecessarily obscure the gist of the invention.

[0041] As used herein, the terms “joining” or “connecting” include not only cases where one member is directly joined or directly connected to another member, but also cases where one member is indirectly joined or indirectly connected to another member via a connecting member.

[0042] Figure 3 is a coupled perspective view of a battery module according to one embodiment of the present invention, and Figure 4 shows the reverse inflow prevention member of Figure 3 separated from the module case. Figure 5 is a front view of a battery module according to one embodiment of the present invention, and Figure 6 is a perspective view showing the bottom surface of the reverse inflow prevention member in a battery module according to one embodiment of the present invention. Figure 7 shows the reverse inflow prevention member of Figure 3 partially cut open, and Figure 8 is an enlarged view of part A in Figure 7.

[0043] Referring to Figure 3, a battery module 10 according to one embodiment of the present invention includes a battery cell stack 100 (see Figure 9), a module case 200, and a reverse inflow prevention member 300.

[0044] The battery cell stack 100 may be configured such that a plurality of battery cells 110 are stacked on top of each other. The battery cells 110 may have diverse structures, and the plurality of battery cells 110 may be stacked in diverse ways.

[0045] The battery cell 110 may have a structure in which multiple unit cells arranged in the order of positive electrode plate / separator / negative electrode plate, or bi-cells arranged in the order of positive electrode plate / separator / negative electrode plate / separator / positive electrode plate / separator / negative electrode plate are stacked according to the battery capacity.

[0046] The battery cell 110 may be provided with electrode leads. Electrode leads are a type of terminal exposed to the outside and connected to external devices, and may be made of a conductive material. Electrode leads may include a positive electrode lead and a negative electrode lead.

[0047] Multiple battery cells 110 may be electrically connected by busbars (not shown). However, busbars are not shown in the drawings.

[0048] The battery cell stack 100 may comprise a plurality of cartridges (not shown) that house the battery cells 110. Each cartridge (not shown) may be manufactured by plastic injection molding, and a plurality of cartridges (not shown) having a housing for housing the battery cells 110 can be stacked. The cartridge assembly formed by stacking the plurality of cartridges (not shown) may be provided with connector elements or terminal elements.

[0049] The connector element may include various forms of electrical connection components or connection members for connecting to, for example, a Battery Management System (BMS) (not shown) that can provide data relating to the voltage or temperature of the battery cell 110.

[0050] The terminal element is a main terminal connected to the battery cell 110, and includes a positive terminal and a negative terminal. The terminal element can be electrically connected to the outside by being provided with terminal bolts. On the other hand, the battery cell 110 can have a variety of shapes.

[0051] The module case 200 houses the battery cell stack 100 (see Figure 9). Referring to Figure 4, the module case 200 has exhaust holes 211 through which gas is released.

[0052] Referring to Figure 4, the module case 200 includes an upper case 210, a lower case 220, and a side case 230, and the discharge hole 211 may, for example, be formed in the upper case 210, but is not limited thereto. Referring to Figures 3 and 4, a backflow prevention member 300 may be connected to the upper case 210.

[0053] The module case 200 encloses the battery cell 110, thereby protecting the battery cell 110 from external vibrations and shocks.

[0054] The module case 200 may include a mica plate formed from mica that has both thermal insulation and heat resistance properties to prevent flame leakage. Here, the mica plate may include not only flat mica plates but also shapes that combine flat and curved surfaces.

[0055] The module case 200 can be formed in a shape that corresponds to the shape of the battery cell stack 100. For example, if the battery cell stack 100 is provided in a hexahedral shape with a square cross-section, the module case 200 can also be provided in a corresponding hexahedral shape.

[0056] The module case 200 can be manufactured, for example, by bending a plate of metal material, thereby allowing the module case 200 to be manufactured as a single unit. When the module case 200 is manufactured as a single unit, it has the effect of simplifying the joining process. Alternatively, the module case 200 can be provided as a separate unit and joined by welding or the like. However, the material of the module case 200 is not limited to metal material.

[0057] Referring to Figures 3 and 4, the reverse flow prevention member 300 can be coupled to the module case 200, for example, to the upper case 210 of the module case 200. The reverse flow prevention member 300 prevents high-temperature discharges generated from the battery cell 110 from flowing out of the module case 200 and then flowing back into the module case 200 (reverse flow).

[0058] Furthermore, the reverse flow prevention member 300 prevents high-temperature discharge generated from the battery cell 110 and flowing out of the module case 200 from being transferred or propagated to other adjacent battery modules 10.

[0059] Here, high-temperature discharges include, but are not limited to, gases, various types of high-temperature particles, flames, cell electrodes, etc.

[0060] Referring to Figures 4, 6, and 7, the backflow prevention member 300 may have a movable hole 311 that communicates with the discharge hole 211. The backflow prevention member 300 may also have an inclined portion 340 to prevent backflow, transfer, or propagation of the discharged material that has moved through the movable hole 311.

[0061] The reverse inflow prevention member 300 can be formed into a variety of shapes. Referring to Figure 4, it can be formed into a hexahedral shape with a quadrilateral cross-section, but it is not limited to this. However, for the sake of explanation, the following description will focus on the case where the reverse inflow prevention member 300 is formed into a hexahedral shape.

[0062] Referring to Figures 4 to 6, the backflow prevention member 300 may include a lower portion 310, a side portion 320, and an upper portion 330.

[0063] A movable hole 311 communicating with the discharge hole 211 is formed in the lower portion 310. That is, when a flame is generated in the battery cell 110, the high-temperature discharge generated by the flame is discharged to the outside of the module case 200 through the discharge hole 211 and moves into the backflow prevention member 300 through the movable hole 311 communicating with the discharge hole 211. A detailed explanation of this will be given later.

[0064] The side sections 320 are connected to the bottom section 310. The side sections 320 are formed in pairs and are connected to both ends of the bottom section 310 and to both ends of the top section 330.

[0065] The upper portion 330 is connected to the side portions 320 at both ends. The upper portion 330 is separated from the lower portion 310 by a predetermined distance. This creates a predetermined space between the upper portion 330 and the lower portion 310. Gas can then be discharged through the space formed between the upper portion 330 and the lower portion 310.

[0066] For example, referring to Figures 4 and 5, at least one of the front portion 350 and the rear portion 360 of the backflow prevention member 300 can be opened. In Figure 5, both the front portion 350 and the rear portion 360 of the backflow prevention member 300 are open, but if necessary, only one of the front portion 350 or the rear portion 360 can be opened.

[0067] Then, the gas that has moved into the backflow prevention member 300 through the movable hole 311 which communicates with the discharge hole 211 is discharged to the outside of the backflow prevention member 300 through the front part 350 and the rear part 360 of the backflow prevention member 300, and can be discharged to the outside of the pack case 21 through the vent part 23 formed in the pack case 21, which will be described later.

[0068] This method enables directional venting, which allows gases to be discharged in the direction intended by the designer.

[0069] Referring to Figure 5, the inclined portion 340 may be connected to the lower portion 310 and the upper portion 330, respectively, and may be formed to incline from the lower portion 310 toward the upper portion 330. Referring to Figures 7 and 8, the inclined portion 340 may be configured to connect the side of the movable hole 311 with the upper portion 330.

[0070] Referring to Figures 5 and 8, the inclined portion 340 is formed to be located above at least a portion of the movable hole 311. That is, because the inclined portion 340 is located above the movable hole 311, the high-temperature discharged material moving upward from the movable hole 311 (see arrow a in Figure 8) strikes the inclined portion 340.

[0071] Here, the inclination angle of the inclined portion 340 can be formed to have a range in which the discharged material that has moved through the movable hole 311 strikes the inclined portion 340 and is reflected in a direction different from the direction in which the movable hole 311 is located.

[0072] Therefore, the high-temperature discharged material that hits the inclined section 340 moves in a direction other than where the movable hole 311 is located (see arrow b in Figure 8), so it does not flow back into the module case 200 from the movable hole 311, and the high-temperature discharged material is blocked by the reverse flow prevention member 300, so it is not transferred or propagated to other battery modules 10.

[0073] This disperses the high-temperature discharged material, preventing heat from concentrating on any one of the battery modules 10, and thus preventing thermal runaway caused by heat propagation.

[0074] On the other hand, referring to Figure 5, the backflow prevention member 300 can be coupled to the upper case 210. Here, as mentioned above, the backflow prevention member 300 can be coupled to the upper case 210 such that the movable hole 311 formed in the backflow prevention member 300 communicates with the discharge hole 211 formed in the upper case 210 (see Figure 7).

[0075] Here, the backflow prevention member 300 can be connected to the upper case 210 in a variety of ways. For example, it can be connected by screws 400, bolts or pins, but is not limited to these.

[0076] Figure 9 is a cross-sectional view of a battery pack according to one embodiment of the present invention, and Figure 10 is a diagram showing the vent portion of the battery pack according to one embodiment of the present invention.

[0077] The following describes a battery pack 20 according to one embodiment of the present invention. Any information that is common to the battery module 10 described above will be referred to in the previous description.

[0078] Referring to Figure 9, a battery pack 20 according to one embodiment of the present invention includes one or more battery modules 10 according to the embodiments described above. Furthermore, a battery pack 20 according to one embodiment of the present invention includes a pack case 21 for housing the battery modules 10.

[0079] The pack case 21 may include an upper frame 22. The reverse inflow prevention member 300 included in the battery module 10 may be in contact with the inside of the upper frame 22. With this structure, the upper frame 22 pressurizes the reverse inflow prevention member 300, thereby suppressing upward venting of the battery module 10.

[0080] As shown in Figure 9, the first inclined portion 340a of the first reverse inflow prevention member 300a in the first battery module 10a and the second inclined portion 340b of the second reverse inflow prevention member 300b in the second battery module 10b adjacent to the first battery module 10a can be formed in opposite directions to each other.

[0081] That is, the first inclined portion 340a may be formed such that the high-temperature ejected material generated from the first battery module 10a is directed away from the second battery module 10b. Also, the second inclined portion 340b may be formed such that the high-temperature ejected material generated from the second battery module 10b is directed away from the first battery module 10a.

[0082] With this structure, even if a flame occurs in one of the battery modules 10, the high-temperature discharge will not be transferred or propagated to other adjacent battery modules 10, thereby preventing thermal runaway.

[0083] Referring to Figure 10, a vent section 23 may be formed in the pack case 21. Here, the vent section 23 may include a vent hole 25 and a vent valve 26.

[0084] The vent holes 25 are holes through which gas generated from the battery cells 110 is discharged, and can be formed in the pack case 21.

[0085] A vent valve 26 may be provided in the vent hole 25. The vent valve 26 can be configured in various ways. For example, the vent valve 26 may be configured to close the vent hole 25 and open when the internal pressure of the pack case 21 exceeds a preset value.

[0086] In other words, although the vent valve 26 closes the vent hole 25, if gas leaks from the battery cell 110 and the internal pressure of the pack case 21 exceeds a preset value or range, the vent valve 26 opens and the gas is discharged from the pack case 21 through the vent hole 25.

[0087] As mentioned above, the gas discharged from the module case 200 through the discharge hole 211 of the module case 200 can move into the backflow prevention member 300 through the movable hole 311 which communicates with the discharge hole 211.

[0088] The gas that has moved into the backflow prevention member 300 can be discharged to the outside of the backflow prevention member 300 from the front portion 350 and the rear portion 360 of the backflow prevention member 300. The gas discharged to the outside of the backflow prevention member 300 can then be discharged to the outside of the pack case 21 from the vent portion 23 formed in the pack case 21.

[0089] As a result, the high-temperature discharge is blocked by the inclined section 340, but the gas is discharged in a predetermined direction, thus enabling directional venting in this manner.

[0090] On the other hand, a battery pack 20 according to one embodiment of the present invention may further include various devices for controlling the charging and discharging of the battery cells 110 housed in the battery module 10, such as a BMS, current sensors, fuses, and the like.

[0091] Figure 11 is a diagram illustrating an automobile including a battery pack according to each embodiment of the present invention.

[0092] Referring to Figure 11, an automobile 30 according to one embodiment of the present invention may include one or more battery modules 10 according to the embodiments described above. Alternatively, an automobile 30 according to one embodiment of the present invention may include one or more battery packs 20 according to the embodiments described above. Here, the battery pack 20 may include one or more battery modules 10 according to the embodiments described above.

[0093] Furthermore, the aforementioned automobile 30 includes various types of automobiles that use electricity, such as electric vehicles and hybrid vehicles.

[0094] In this specification, terms indicating direction such as up, down, left, right, front, and back are used. However, such terms indicate relative positions and are used only for the convenience of explanation. It is obvious to those skilled in the art that these positions can change depending on the position of the object in question, the observer's position, etc.

[0095] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and of course, various modifications and variations are possible within the equivalent scope of the technical concept of the present invention and the claims below by persons with ordinary skill in the art to which the present invention pertains. Therefore, the embodiments described above should be considered from an explanatory rather than restrictive viewpoint. That is, the true technical concept of the present invention is shown in the claims, and all differences within the equivalent scope thereto should be interpreted as being included in the present invention. [Industrial applicability]

[0096] The present invention relates to battery modules, battery packs containing the same, and automobiles, and is particularly applicable to the secondary battery industry.

Claims

1. A battery cell stack in which multiple battery cells are stacked, A module case in which the aforementioned battery cell stack is housed and which has an exhaust hole formed therein for releasing gas, A battery module comprising a reverse inflow prevention member coupled to the module case, which prevents discharge generated from the battery cell from flowing back into the module case after it has flowed out to the outside of the module case.

2. The battery module according to claim 1, characterized in that the reverse inflow prevention member has a movable hole that communicates with the discharge hole, and a slanted portion is formed to prevent the discharged material that has moved through the movable hole from flowing back in.

3. The battery module according to claim 2, characterized in that the inclined portion is formed to be located above at least a portion of the movable hole.

4. The battery module according to claim 3, characterized in that the inclination angle of the inclined portion is formed to have a range in which the discharged material that has moved through the moving hole strikes the inclined portion and is reflected in a direction different from the direction in which the moving hole is located.

5. The aforementioned module case includes the upper case, The discharge hole is formed in the upper case. The battery module according to claim 2, characterized in that the reverse inflow prevention member is coupled to the upper case.

6. The battery module according to claim 5, characterized in that the reverse inflow prevention member is connected to the upper case by a screw, bolt or pin.

7. The aforementioned reverse inflow prevention member is A lower surface portion having a movable hole that communicates with the aforementioned discharge hole, The side portion connected to the lower portion, It includes an upper surface that is connected to the side surface and separated from the lower surface so that a space is formed between it and the lower surface, The battery module according to claim 2, characterized in that the inclined portion is connected to the lower portion and the upper portion, respectively, and is formed to be inclined from the lower portion toward the upper portion.

8. The battery module according to claim 7, characterized in that the inclined portion connects the side portion and the top portion of the movable hole.

9. The battery module according to claim 1, characterized in that the reverse inflow prevention member has at least one of its front and rear portions open to allow gas to move.

10. A plurality of battery modules according to any one of claims 1 to 9, A battery pack including a pack case that houses the aforementioned multiple battery modules.

11. The aforementioned pack case includes an upper frame, The battery pack according to claim 10, characterized in that the reverse inflow prevention member is in contact with the inside of the upper frame.

12. The backflow prevention member has a movable hole that communicates with the discharge hole, and a slanted portion is formed to prevent the backflow of the discharged material that has moved through the movable hole. The battery pack according to claim 11, characterized in that the first inclined portion of the first reverse inflow prevention member of the first battery module and the second inclined portion of the second reverse inflow prevention member of the second battery module adjacent to the first battery module are formed in opposite directions to each other.

13. The battery pack according to claim 10, characterized in that a vent portion is formed in the pack case.

14. The aforementioned vent section is, A vent hole through which gas generated from the aforementioned battery cell is discharged, The battery pack according to claim 13, further comprising a vent valve that closes the vent hole and is opened when the internal pressure of the pack case exceeds a preset value.

15. The battery pack according to claim 13, characterized in that the gas discharged from the discharge hole is discharged from the vent portion.

16. An automobile comprising at least one battery module according to any one of claims 1 to 9.

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