Battery pack and vehicle including same

Abstract

Disclosed are a battery pack and a vehicle including same. The battery pack according to an embodiment of the present invention comprises: a plurality of battery modules having a plurality of stacked battery cells; a pack case in which the plurality of battery modules is accommodated; and a fastening member for fastening the pack case, wherein at least a part of the fastening member is inserted into and fixed to the pack case, and at least a part of the fastening member is configured to melt or burn when the temperature increases.

Description

Battery pack and vehicle including same

[0001] This application claims priority to Korean Patent Application No. 10-2024-0046651, filed on April 5, 2024, and all contents disclosed in the specification and drawings of the said application are incorporated herein by reference.

[0002] The present invention relates to a battery pack and a vehicle including the same, and more particularly, to a battery pack and a vehicle including the same, which can evenly spread heat and smoothly discharge gas when a thermal event occurs.

[0003] Generally, secondary batteries refer to batteries that can be repeatedly charged and discharged, such as lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. A battery cell, the most basic type of secondary battery, can provide an output voltage of approximately 2.5 V to 4.2 V.

[0004] Recently, as these battery cells are applied to devices that require high output voltage and large charging capacity, such as electric vehicles and Energy Storage Systems (ESS), battery modules composed of multiple battery cells connected in series, parallel, or a combination of series and parallel, and battery packs composed of these battery modules connected again in series, parallel, or a combination of series and parallel, are widely used.

[0005] Lithium secondary batteries are currently in the spotlight due to their advantages such as high operating voltage and significantly higher energy density. However, because they use organic electrolytes, there is a problem that lithium secondary batteries can cause overcurrent and overheating when overcharged, which in severe cases can cause fire due to explosion or ignition.

[0006] Various types of secondary batteries include battery modules in which a plurality of battery cells are stacked and inserted into a module case that is equipped with a module case that can protect the battery cells, and battery packs including a plurality of battery modules.

[0007] Figure 1 is a cross-sectional view of a conventional battery pack.

[0008] Referring to Fig. 1, in the case of a conventional battery pack (1), the upper frame (2) is fixed to the bulkhead frame (4) by a bolt (3). That is, in the conventional battery pack (1), since the upper frame (2) is firmly fixed to the bolt (3), no free space or buffer space is formed through which heat or gas caused by the flame can move when a flame occurs.

[0009] In this state, if a flame occurs in the battery cell (5), the heat caused by the flame is blocked by the upper frame (2) and cannot spread, but is concentrated within the battery module (6) where the flame occurred. In addition, since the gas generated within the battery module (6) cannot be discharged, the internal pressure increases and the possibility of explosion of the battery module (6) or battery pack (1) increases.

[0010] At this time, if an explosion occurs in the battery module (6) where the flame occurred, the flame may spread to other battery modules (6) and a thermal runaway phenomenon may occur. If the flame leaks out due to this thermal runaway phenomenon, there is a problem that the driver of the electric vehicle may be burned or put in a dangerous situation.

[0011] Alternatively, there is a problem in that the battery module (6) or battery pack (1) is damaged or burned down by a chain reaction of flames due to flame propagation, making it impossible to secure the stability of the battery module (6) or battery pack (1).

[0012] Accordingly, the technical problem to be achieved by the present invention is to provide a battery pack and an automobile including the same, which can prevent heat concentration by evenly dispersing heat caused by a flame within the battery pack when a flame occurs from a single battery cell, thereby achieving uniform thermal distribution.

[0013] In addition, the present invention provides a battery pack and a vehicle including the same, which enable easy venting and easy discharge of gases.

[0014] In addition, the present invention provides a battery module capable of preventing a thermal runaway phenomenon by preventing a chain reaction of flames due to flame propagation, a battery pack including the same, and a vehicle.

[0015] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0016] According to one aspect of the present invention, a battery pack may be provided, comprising: a plurality of battery modules in which a plurality of battery cells are stacked; a pack case in which the plurality of battery modules are accommodated; and a fastening member fastening the pack case, wherein at least a portion of the fastening member is inserted into and fixed to the pack case, and at least a portion thereof melts or burns when the temperature rises.

[0017] In one embodiment, a fastening joint hole is formed in the pack case, and the fastening member includes a bolt and a first nut, and the first nut is made of a meltable or flammable material and can be inserted into and fixed in the fastening joint hole of the pack case.

[0018] In one embodiment, the first nut may be fitted into the fastening hole of the pack case.

[0019] In one embodiment, the first nut may be made of plastic.

[0020] In one embodiment, a bushing member may be coupled to the pack case on the upper side of the first nut to prevent breakage of the first nut and increase fixing force.

[0021] In one embodiment, the bolt may pass through the bushing member and be coupled to the first nut.

[0022] In one embodiment, the bushing member may be welded to the pack case.

[0023] In one embodiment, the outer diameter of the bushing member may be larger than the outer diameter of the first nut.

[0024] In one embodiment, the pack case includes an upper frame; and a bulkhead frame fastened to the upper frame by the fastening member, wherein the fastening coupling hole is formed in the bulkhead frame, and the first nut can be inserted into and fixed into the fastening coupling hole of the bulkhead frame.

[0025] In one embodiment, the fastening member includes a second nut coupled to the upper frame, and the bolt can be fastened to each of the first nut and the second nut.

[0026] In one embodiment, the second nut may be welded to the upper frame.

[0027] In one embodiment, the second nut may be separate from the bulkhead frame.

[0028] In one embodiment, when a flame is generated in the battery cell and the first nut melts, the bolt may be separated from the bulkhead frame, causing the upper frame to deform upward, and a buffer space may be formed between the upper frame and the battery module.

[0029] In one embodiment, a venting portion is formed in the pack case, and when the upper frame is deformed, gas generated from the battery cell can move to the venting portion.

[0030] Meanwhile, according to another aspect of the present invention, a vehicle including at least one battery pack as described above can be provided.

[0031] Embodiments of the present invention have the effect of preventing heat concentration by evenly dispersing heat caused by a flame within a battery pack when a flame occurs from one battery cell, thereby achieving uniform thermal distribution.

[0032] Additionally, it has the effect of facilitating venting, allowing gas to be discharged easily.

[0033] Additionally, it has the effect of preventing thermal runaway by preventing a chain reaction of flames due to flame propagation.

[0034] However, the effects that can be obtained through the present invention are not limited to the effects described above, and other technical effects not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0035] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0036] Figure 1 is a cross-sectional view of a conventional battery pack.

[0037] Figure 2 is an exploded perspective view of a battery pack according to one embodiment of the present invention.

[0038] FIG. 3 is a cross-sectional view of a battery pack according to one embodiment of the present invention, wherein a bolt is separated from a first nut fixed to the inside of a bulkhead frame.

[0039] Figure 4 is a drawing showing the bolt in Figure 3 coupled to the first nut fixed to the inside of the bulkhead frame.

[0040] Figure 5 is a drawing showing the first nut in Figure 4 melting and the upper frame and bolt being separated from the bulkhead frame.

[0041] FIG. 6 is a cross-sectional view showing a buffer space formed when the first nut melts and the upper frame is deformed in a battery pack according to one embodiment of the present invention.

[0042] FIG. 7 is a perspective view of a battery pack according to a modified embodiment of the present invention, with only a portion shown.

[0043] FIG. 8 is a drawing for explaining a vehicle including a battery pack according to each embodiment of the present invention.

[0044] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Terms or words used in this specification and claims should not be interpreted as limited to their conventional or dictionary meanings, but should be interpreted with meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to best explain his or her own invention. Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of ​​the present invention, and various equivalents and modifications may exist as of the time of this application.

[0045] In the drawings, the sizes of each component or specific parts of that component are exaggerated, omitted, or schematically illustrated for convenience and clarity of explanation. Therefore, the size of each component does not entirely reflect its actual size. If a detailed description of a related known function or configuration is deemed to unnecessarily obscure the gist of the present invention, such description will be omitted.

[0046] The term 'joint' or 'connection' as used herein includes 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 through a connecting member.

[0047] FIG. 2 is an exploded perspective view of a battery pack according to one embodiment of the present invention, FIG. 3 is a cross-sectional view of a battery pack according to one embodiment of the present invention in which a bolt is separated from a first nut fixed to the inside of a bulkhead frame, FIG. 4 is a view showing a bolt coupled to a first nut fixed to the inside of a bulkhead frame in FIG. 3, FIG. 5 is a view showing a state in which the first nut in FIG. 4 melts and the upper frame and bolt are separated from the bulkhead frame, and FIG. 6 is a cross-sectional view showing a state in which a buffer space is formed as the first nut melts and the upper frame is deformed in a battery pack according to one embodiment of the present invention.

[0048] Referring to FIG. 2, a battery pack (10) according to one embodiment of the present invention may be configured to include a plurality of battery modules (100), a pack case (200), and a fastening member (300).

[0049] The battery module (100) is housed in a pack case (200). Furthermore, a plurality of battery cells (110, see FIG. 6) are stacked on each battery module (100), and a plurality of battery modules (100) may be provided and arranged in various ways. For example, the battery modules (100) may be arranged in a horizontal or vertical direction, but are not limited thereto.

[0050] A battery module (100) may include a plurality of battery cells (110) and a module case (120, see FIG. 6).

[0051] A plurality of battery cells (110) can be stacked on top of each other. The battery cells (110) can have various structures, and furthermore, the plurality of battery cells (110) can be stacked in various ways.

[0052] The battery cell (110) may have a structure in which a plurality of unit cells arranged in the order of positive plate-separator-negative plate or bi-cells arranged in the order of positive plate-separator-negative plate-separator-positive plate-separator-negative plate are stacked according to the battery capacity.

[0053] The battery cell (110) may be equipped with an electrode lead. The electrode lead is a type of terminal that is exposed to the outside and connected to an external device, and may be made of a conductive material. The electrode lead may include a positive electrode lead and a negative electrode lead.

[0054] The positive electrode lead and the negative electrode lead may be positioned in opposite directions with respect to 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 with respect to the longitudinal direction of the battery cell (110).

[0055] A battery cell (110) may be provided with a plurality of cartridges (not shown) for storing the battery cell (110). Each cartridge (not shown) may be manufactured by injection molding plastic, and a plurality of cartridges (not shown) having a storage portion capable of storing the battery cell (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.

[0056] The connector element may include various types of electrical connection components or connecting members for connection to, for example, a BMS (Battery Management System, not shown) that can provide data on the voltage or temperature of the battery cell (110).

[0057] In addition, 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 is provided with a terminal bolt so that it can be electrically connected to the outside. Meanwhile, the battery cell (110) may have various shapes.

[0058] A plurality of battery cells (110) are stacked and stored 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 shocks.

[0059] The module case (120) may be formed in a shape corresponding to the shape of a stacked body in which a plurality of battery cells (110) are stacked. For example, if the stacked body in which a plurality of battery cells (110) are stacked is formed in a hexahedral shape, the module case (120) may also be formed in a hexahedral shape corresponding thereto. However, the present invention is not limited thereto. Here, the module case (120) may include an upper module case (120), a lower module case (120), and a side module case (120).

[0060] In addition, the module case (120) can be manufactured by, for example, bending a metal plate, whereby the module case (120) can be manufactured as an integral part. When the module case (120) is manufactured as an integral part, the joining process is simplified and simplified. Alternatively, the module case (120) can be provided in a detachable form and joined by welding or the like. However, the material of the module case (120) is not limited to a metal material.

[0061] A plurality of battery modules (100) are stored in the pack case (200). The pack case (200) may be configured to include, for example, an upper frame (210), a lower frame (220), a side frame (230), and a bulkhead frame (240).

[0062] Referring to FIGS. 2 and 6, the upper frame (210) is coupled to the side frame (230) and the bulkhead frame (240). Here, the bulkhead frame (240) is coupled by a fastening member (300) configured to melt or burn at least a portion thereof when the temperature rises. For example, the fastening member (300) may be a bolt (310) and a first nut (320), wherein the first nut (320) is a nut configured to melt or burn by a flame, and the bolt (310) may be a general bolt or a bolt configured to melt or burn by a flame.

[0063] And, the upper frame (210) is fixed to the side frame (230) by a commonly used bolt (310a, see FIG. 2).

[0064] That is, when a thermal event occurs in the battery cell (110), etc., the upper frame (210) is fixed to the side frame (230) by a normal bolt (310a), but the first nut (320) of the fastening member (300) that fastens the bulkhead frame (240) melts or burns, so that the upper frame (210) is separated from the bulkhead frame (240) in the thermal event situation (see FIG. 6), and thereby a buffer space (500) can be formed between the upper frame (210) and the bulkhead frame (240). A detailed description thereof will be given later.

[0065] The lower frame (220) is configured to accommodate a plurality of battery modules (100). The lower frame (220) may be formed in a square plate shape, but is not limited thereto. The lower frame (220) forms the bottom of the pack case (200).

[0066] The side frame (230) may be configured to extend upward from the edge of the lower frame (220). The side frame (230) defines the height of the pack case (200) and forms a preset space between it and the lower frame (220).

[0067] And, a plurality of battery modules (100) are installed in the space between the side frame (230) and the lower frame (220). The side frame (230) may include a relatively long long side frame (230) and a relatively short short side frame (230). Alternatively, the lengths of the side frames (230) may all be the same.

[0068] The bulkhead frame (240) extends upward from within the lower frame (220) and is coupled to the side frame (230). One or more bulkhead frames (240) may be provided, and the battery module (100) may be arranged between a plurality of bulkhead frames (240) or between the bulkhead frames (240) and the side frame (230). Here, the bulkhead frames (240) may be arranged in a horizontal or vertical direction within the side frame (230).

[0069] And, referring to FIG. 3, a fastening hole (241) may be formed in the bulkhead frame (240) so that the upper frame (210) is fastened by a fastening member (300).

[0070] The fastening member (300) is configured to fasten the upper frame (210) of the pack case (200). Here, at least a portion of the fastening member (300) is inserted into and fixed to the pack case (200). Referring to FIG. 3, for example, the fastening member (300) may include a bolt (310) and a first nut (320), and the first nut (320) may be inserted into and fixed to the fastening joint hole (241) of the bulkhead frame (240) of the pack case (200). For example, the first nut (320) may be firmly coupled to and fixed to the fastening joint hole (241) of the bulkhead frame (240) by a fitting connection (e.g., a force-fit method).

[0071] In addition, the fastening member (300) is configured so that at least a portion thereof melts or burns when the temperature rises. For example, the first nut (320) of the fastening member (300) may be configured to melt or burn. That is, in the battery pack (10) according to one embodiment of the present invention, the first nut (320) is configured to melt or burn when the temperature rises due to a flame or the like.

[0072] And, as described above, the first nut (320) configured to melt or burn by a temperature rise, and the bolt (310) fastened to the first nut (320) fasten the upper frame (210) and the bulkhead frame (240). Here, the bolt (310) may be a general bolt, or may be a bolt configured to melt or burn by a flame.

[0073] The fastening member (300) may vary. However, for convenience of explanation, the following description focuses on a case where the fastening member (300) includes a general bolt (310) and a first nut (320) configured to melt or burn due to a rise in temperature.

[0074] Referring to FIGS. 3 and 4, as described above, the first nut (320) is inserted into and fixed in the fastening joint hole (241) of the bulkhead frame (240). In addition, the first nut (320) is made of various types of melting or burning materials.

[0075] That is, the first nut (320) may be formed of various materials so as to be configured to melt or burn at least partially when the temperature rises, and may be made of, for example, various plastic materials that can melt at a preset temperature, but is not limited thereto.

[0076] Here, the bushing member (400) can be coupled to the bulkhead frame (240) of the pack case (200). That is, in order to prevent damage to the first nut (320) and increase the fixing force, for example, the bushing member (400) can be coupled to the fastening joint hole (241) of the bulkhead frame (240) so that it is positioned on the upper side of the first nut (320).

[0077] And, in this structure, the bolt (310) can pass through the bushing member (400) and be connected to the first nut (320).

[0078] The bushing member (400) can be joined to the bulkhead frame (240) of the pack case (200) in various ways, for example, by welding, but is not limited thereto. For example, the bushing member (440) can also be joined to the fastening joint hole (241) of the bulkhead frame (240) in a force-fit manner, similar to the first nut (320).

[0079] And, as in FIG. 5, the outer diameter of the bushing member (400) may be configured to be larger than the outer diameter of the first nut (320) to support the first nut (320) on the upper side of the first nut (320).

[0080] In addition, the fastening member (300) may include a second nut (330) coupled to the upper frame (210), in which case the bolt (310) is fastened to the first nut (320) and the second nut (330), respectively.

[0081] As described above, the second nut (330) is coupled to the upper frame (210), and here, the way in which the second nut (330) is coupled to the upper frame (210) may be various, and for example, it may be coupled by welding, but is not limited thereto.

[0082] In Fig. 4, the second nut (330) is not coupled to the bulkhead frame (240) but is separated from the bulkhead frame (240). In Fig. 4, the second nut (330) and the bulkhead frame (240) are in contact, but the second nut (330) and the bulkhead frame (240) may be spaced apart from each other by a preset interval.

[0083] Referring to FIG. 4, the bolt (310) is coupled to a second nut (330) coupled to the upper frame (210) to first fasten the upper frame (210) and the bulkhead frame (240), and further, the bolt (310) is coupled to a first nut (320) to second fasten the upper frame (210) and the bulkhead frame (240).

[0084] Here, when a thermal event occurs in the battery cell (110), the first nut (320) melts and burns. And, as shown in FIG. 5, when the first nut (320) fastened to the bolt (310) melts, the fastening force of the bolt (310) weakens, and the upper frame (210) and the bolt (310) are separated from the bulkhead frame (240).

[0085] Referring to FIG. 6, when a flame is generated in the battery cell (110) and the first nut (320) melts, the bolt (310) is separated from the bulkhead frame (240) and the upper frame (210) is deformed upward, thereby forming a buffer space (500) between the upper frame (210) and the battery module (100).

[0086] That is, the upper frame (210) is deformed upward by the flame and gas generated from the battery cell (110) to form a buffer space (500), and as the heat from the flame spreads to other battery modules (100) through the buffer space (500), an overall uniform thermal distribution is achieved, and heat can be prevented from being concentrated in any one battery module (100).

[0087] FIG. 7 is a perspective view of a battery pack according to a modified embodiment of the present invention, with only a portion shown.

[0088] Referring to Fig. 7, there is a difference from the aforementioned embodiment in that a venting portion (250) is formed in the pack case (200). However, among the modified embodiments, the common content described in the aforementioned embodiment is replaced with the description of the aforementioned embodiment. In addition, the content applicable to the aforementioned embodiment among the portions described in the modified embodiments may be applied to the aforementioned embodiment.

[0089] Referring to Fig. 7, a venting portion (250) is formed in the pack case (200). As described above, when the temperature rises and the first nut (320) melts, causing the upper frame (210) to deform, gas generated from the battery cell (110) can move to the venting portion (250) and be discharged.

[0090] The venting portion (250) may include a venting hole (251) and a venting valve (252). The venting hole (251) is a hole through which gas generated from the battery cell (110) is discharged, and may be formed in the pack case (200), for example, the side frame (230), but is not limited thereto.

[0091] In addition, a venting valve (252) may be installed in the venting hole (251). The venting valve (252) may be configured in various ways. For example, the venting valve (252) may be configured to close the venting hole (251) and open when the internal pressure of the pack case (200) exceeds a preset value.

[0092] That is, the venting valve (252) normally blocks the venting hole (251), but when gas leaks from the battery cell (110) and the internal pressure of the pack case (200) exceeds a preset value or range, the venting valve (252) opens and the gas is discharged from the pack case (200) through the venting hole (251).

[0093] As described above, when the upper frame (210) is deformed upwards by the flame and gas generated from the battery cell (110) to form a buffer space (500), the gas moves along the buffer space (500) to the venting portion (250), and when the venting valve (252) is opened by the pressure of the gas, the gas can be discharged to the outside of the pack case (200).

[0094] That is, the venting is facilitated by the buffer space (500) formed by the deformation of the upper frame (210), so that gas can be easily discharged.

[0095] And, as described above, as the heat spreads to other battery modules (100) through the buffer space (500), concentration of heat in any one battery module (100) is prevented, thereby enabling uniform thermal distribution.

[0096] In addition, since the discharge of gas is facilitated by the buffer space (500) formed between the upper frame (210) and the battery module (100), ultimately, a chain reaction of flames due to flame propagation is prevented, thereby preventing a thermal runaway phenomenon.

[0097] FIG. 8 is a drawing for explaining an automobile including a battery pack (10) according to each embodiment of the present invention.

[0098] Referring to FIG. 8, a vehicle (20) according to one embodiment of the present invention may include one or more battery packs (10) according to each of the embodiments described above. Here, the vehicle (20) includes various types of vehicles that are designed to use electricity, such as electric vehicles or hybrid vehicles.

[0099] In this specification, when terms indicating directions such as up, down, left, and right are used, these terms are only for convenience of explanation, and it is obvious to those skilled in the art that these terms may vary depending on the location of the target object or the location of the observer.

[0100] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and those skilled in the art to which the present invention pertains may make various modifications and variations within the scope of the technical spirit of the present invention and the equivalent scope of the claims to be described below. Therefore, the embodiments disclosed above should be considered from an illustrative rather than a restrictive perspective. In other words, the true scope of the technical spirit of the present invention is set forth in the claims, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

[0101] The present invention relates to a battery pack and an automobile including the same, and is particularly applicable to industries related to secondary batteries.

Claims

1. Multiple battery modules in which multiple battery cells are stacked; A pack case in which the plurality of battery modules are stored; and Includes a fastening member for fastening the above pack case, A battery pack characterized in that at least a portion of the fastening member is inserted and fixed into the pack case, and at least a portion thereof melts or burns when the temperature rises.

2. In paragraph 1, A fastening hole is formed in the above pack case, The above fastening member includes a bolt and a first nut, A battery pack characterized in that the first nut is made of a material that melts or burns and is inserted into and fixed in the fastening joint hole of the pack case.

3. In paragraph 2, A battery pack characterized in that the first nut is fitted into the fastening hole of the pack case.

4. In paragraph 2, A battery pack, characterized in that the first nut is made of plastic.

5. In paragraph 4, A battery pack characterized in that a bushing member is coupled to the pack case on the upper side of the first nut to prevent damage to the first nut and increase fixing force.

6. In paragraph 5, A battery pack characterized in that the bolt passes through the bushing member and is connected to the first nut.

7. In paragraph 5, A battery pack characterized in that the above bushing member is welded to the pack case.

8. In paragraph 5, A battery pack characterized in that the outer diameter of the above bushing member is larger than the outer diameter of the above first nut.

9. In paragraph 2, The above pack case is, upper frame; and It includes a bulkhead frame that is connected to the upper frame by the above-mentioned fastening member, A battery pack characterized in that the fastening joint hole is formed in the bulkhead frame, and the first nut is inserted into and fixed in the fastening joint hole of the bulkhead frame.

10. In paragraph 9, The above fastening member includes a second nut coupled to the upper frame, A battery pack, characterized in that the bolts are each fastened to the first nut and the second nut.

11. In paragraph 10, A battery pack characterized in that the second nut is welded to the upper frame.

12. In paragraph 10, A battery pack, characterized in that the second nut is separated from the bulkhead frame.

13. In paragraph 12, A battery pack characterized in that when a flame is generated in the battery cell and the first nut melts, the bolt is separated from the bulkhead frame, the upper frame is deformed upward, and a buffer space is formed between the upper frame and the battery module.

14. In paragraph 9, A venting portion is formed in the above pack case, A battery pack characterized in that when the upper frame is deformed, gas generated from the battery cell moves to the venting portion.

15. A vehicle comprising at least one battery pack according to any one of paragraphs 1 to 14.

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