Battery pack and automobile comprising same

Abstract

Disclosed are a battery pack and an automobile comprising same. A battery pack according to an embodiment of the present invention comprises: 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 for fastening the pack case. The fastening member is configured to be separated by the internal pressure of the pack case.

Description

Battery pack and vehicle including same

[0001] This application claims priority to Korean Patent Application No. 10-2024-0053579, filed on April 22, 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 bolts (3). That is, in the conventional battery pack (1), since the upper frame (2) is firmly fixed by bolts (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 for fastening the pack case, wherein the fastening member is configured to be separated by internal pressure of the pack case.

[0017] In one embodiment, the pack case may have an insertion hole formed therein, and the fastening member may include a bolt coupled to one side of the pack case; and a shaft member inserted into the insertion hole and coupled to the bolt so as to be detachable from the bolt.

[0018] In one embodiment, the shaft member has screw threads formed thereon so that it can be screw-connected to the insertion hole.

[0019] In one embodiment, the bolt has an inner groove formed therein, and the shaft member can be detachably inserted into the inner groove of the bolt.

[0020] In one embodiment, the shaft member includes a first coupling portion coupled to the insertion hole; and a second coupling portion coupled to the inner groove of the bolt, wherein the first coupling portion may be configured as a threaded portion having threads formed therein, and the second coupling portion may be configured as a non-threaded portion having no threads formed therein.

[0021] In one embodiment, the diameter of the first connecting portion may be formed to be larger than the diameter of the second connecting portion.

[0022] In one embodiment, a clearance preventing member may be coupled to the second coupling portion to prevent clearance with the inner groove.

[0023] In one embodiment, the play prevention member may be a rubber bushing.

[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 insertion hole is formed in the bulkhead frame, and the shaft member can be inserted into and fixed to the insertion hole of the bulkhead frame.

[0025] In one embodiment, the fastening member includes a nut coupled to the upper frame, and the bolt can be coupled to the nut and the shaft member, respectively.

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

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

[0028] In one embodiment, when a flame occurs in the battery cell and the pressure inside the pack case increases, the bolt may be separated from the shaft member, 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 a 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 that are 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 an exploded perspective view of a bolt and a shaft member in a battery pack according to one embodiment of the present invention.

[0039] FIG. 4 is a partial cross-sectional view of a battery pack according to one embodiment of the present invention, showing a bolt separated from a shaft member fixed to a bulkhead frame and a nut coupled to an upper frame.

[0040] Figure 5 is a drawing showing the bolt in Figure 4 being connected to the shaft member and nut.

[0041] Figure 6 is a drawing showing the bolt being separated from the shaft member by the pressure inside the pack case in Figure 5.

[0042] FIG. 7 is a cross-sectional view showing a buffer space formed when a bolt is separated from a shaft member due to pressure inside a pack case in a battery pack according to one embodiment of the present invention, thereby deforming the upper frame.

[0043] Figure 8 is a perspective view of a battery pack according to a modified embodiment of the present invention, with only a portion shown.

[0044] FIG. 9 is a drawing for explaining a vehicle including a battery pack according to each embodiment of the present invention.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] FIG. 2 is an exploded perspective view of a battery pack according to an embodiment of the present invention, FIG. 3 is an exploded perspective view of a bolt and a shaft member in a battery pack according to an embodiment of the present invention, FIG. 4 is a partial cross-sectional view of a battery pack according to an embodiment of the present invention in which a bolt is separated from a shaft member fixed to a bulkhead frame and a nut coupled to an upper frame, FIG. 5 is a view illustrating a bolt coupled to a shaft member and a nut in FIG. 4, FIG. 6 is a view illustrating a bolt being separated from a shaft member due to pressure inside a pack case in FIG. 5, and FIG. 7 is a cross-sectional view illustrating a buffer space formed when a bolt is separated from a shaft member due to pressure inside a pack case in a battery pack according to an embodiment of the present invention and an upper frame is deformed.

[0049] 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).

[0050] The battery module (100) is housed in a pack case (200). Furthermore, a plurality of battery cells (110, see FIG. 7) 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.

[0051] Referring to FIG. 7, a battery module (100) may have a plurality of battery cells (110) and a module case (120).

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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).

[0056] 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.

[0057] 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).

[0058] 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.

[0059] 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.

[0060] 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, a lower module case, and a side module case.

[0061] 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.

[0062] Referring to FIG. 2, a plurality of battery modules (100) are stored in a 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).

[0063] Referring to FIGS. 2 and 7, the upper frame (210) is coupled to the side frame (230) and the bulkhead frame (240). Here, the upper frame (210) and the bulkhead frame (240) are coupled by a fastening member (300) configured to be separated when the pressure inside the pack case (200) increases.

[0064] For example, the fastening member (300) may include a bolt (310) and a shaft member (320), wherein the bolt (310) may be configured to separate from the shaft member (320) when the pressure inside the pack case (200) increases.

[0065] Here, the shaft member (320) can be coupled to the bulkhead frame (240). For example, the shaft member (320) can be inserted into and fixed to the bulkhead frame (240), but is not limited thereto.

[0066] And, referring to FIG. 5, the upper frame (210) can be connected to the bulkhead frame (240) by a fastening member (300), for example, a bolt (310) and a shaft member (320). Also, referring to FIG. 2, the upper frame (210) is also fixed to the side frame (230) by a bolt (310).

[0067] And, referring to FIG. 7, when a thermal event occurs in a battery cell (110) or the like and the pressure inside the pack case (200) increases, the upper frame (210) is still fixed by the bolt (310) in the side frame (230), but the bolt (310) is separated from the shaft member (320) due to the internal pressure of the pack case (200), and thus the upper frame (210) is separated from the bulkhead frame (240).

[0068] Accordingly, in a thermal event situation, the upper frame (210) is separated from the bulkhead frame (240), so that a buffer space (400) can be formed between the upper frame (210) and the bulkhead frame (240). A detailed description thereof will be provided later.

[0069] Referring to FIG. 2, 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).

[0070] 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).

[0071] 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.

[0072] 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).

[0073] The bulkhead frame (240) can be fastened and joined to the inside of the upper frame (210) by a fastening member (300), for example, a bolt (310) and a shaft member (320). To this end, referring to FIG. 4, an insertion hole (241) can be formed in the bulkhead frame (240), and the shaft member (320) can be inserted into and fixed into the insertion hole (241) of the bulkhead frame (240).

[0074] The fastening member (300) fastens the pack case (200), and for example, referring to FIG. 5, may be configured to fasten the upper frame (210) and the bulkhead frame (240) of the pack case (200). Here, at least a portion of the fastening member (300), for example, the shaft member (320), is coupled to the pack case (200), and is configured to be separated from the bolt (310) when the pressure inside the pack case (200) increases, as shown in FIG. 6.

[0075] The fastening member (300) may be configured in various ways, and for example, referring to FIG. 3, it may include a bolt (310) and a shaft member (320). Referring to FIG. 5, the bolt (310) may be coupled to one side of the pack case (200), for example, the upper frame (210).

[0076] And, the shaft member (320) can be inserted into an insertion hole (241) formed in the bulkhead frame (240) and can be coupled to the bolt (310) so as to be detachable from the bolt (310). Here, a screw thread can be formed on the inside of the insertion hole (241), and a screw thread can also be formed on the shaft member (320), and the shaft member (320) can be configured to be screw-coupled to the insertion hole (241).

[0077] And, for example, referring to FIG. 3, an inner groove (311) is formed in the bolt (310), and the shaft member (320) can be configured to be detachably inserted into the inner groove (311) of the bolt (310). However, the degree of coupling between the bolt (310) and the shaft member (320) may vary depending on the size of the pack case (200), the number of battery modules (100), the capacity of the battery cell (110), etc.

[0078] Referring to Fig. 3, the shaft member (320) may include a first coupling portion (321) and a second coupling portion (322). The first coupling portion (321) may be configured as a threaded portion with threads formed therein, which is coupled to the insertion hole (241) of the bulkhead frame (240). In addition, the second coupling portion (322) may be configured as a non-threaded portion without threads formed therein, which is coupled by being inserted into the inner groove (311) of the bolt (310).

[0079] That is, referring to FIG. 5, the first coupling portion (321) can be screw-connected to the insertion hole (241) of the bulkhead frame (240), and the second coupling portion (322) can be inserted into the inner groove (311) of the bolt (310). And, as shown in FIG. 6, when the pressure inside the pack case (200) increases, the second coupling portion (322) of the shaft member (320) can be separated from the inner groove (311) of the bolt (310).

[0080] Here, the diameter of the first coupling portion (321) can be formed to be larger than the diameter of the second coupling portion (322). That is, the diameter of the second coupling portion (322) is formed to be smaller than the diameter of the first coupling portion (321) so that the second coupling portion (322) can be easily separated from the inner groove (311) of the bolt (310) in a thermal event situation.

[0081] A clearance preventing member (340) may be attached to the second connecting portion (322) to prevent clearance with the inner groove (311). Since the second connecting portion (322) is simply inserted into the inner groove (311) of the bolt (310), clearance may occur between the second connecting portion (322) and the inner groove (311) of the bolt (310) due to errors in processing, etc.

[0082] In this case, the second connecting portion (322) of the shaft member (320) can be separated from the inner groove (311) of the bolt (310) before a thermal event occurs or before a preset range of internal pressure is reached inside the pack case (200).

[0083] To prevent this, a play prevention member (340) may be coupled to the second coupling portion (322) and positioned between the second coupling portion (322) and the inner groove (311) of the bolt (310). The play prevention member may be made of various materials, and may be, for example, a rubber bushing made of rubber, but is not limited thereto.

[0084] Referring to FIGS. 4 to 6, the fastening member (300) may include a nut (330) that is coupled to the upper frame (210), in which case the bolt (310) is fastened to the nut (330) and is also coupled to the shaft member (320).

[0085] The nut (330) is coupled to the upper frame (210). Here, the way in which the 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.

[0086] Referring to FIG. 5, the nut (330) is separated from the bulkhead frame (240), but a form in which the nut (330) is in contact with the bulkhead frame (240) is also possible.

[0087] Here, the bolt (310) is coupled to the shaft member (320) coupled to the bulkhead frame (240), and further, the bolt (310) is coupled to the nut (330) coupled to the upper frame (210) to fasten the upper frame (210) and the bulkhead frame (240). However, the bolt (310) is coupled to the shaft member (320) so that it can be separated from the shaft member (320) by a pressure within a preset range.

[0088] Referring to FIG. 6, when a thermal event occurs in a battery cell (110) or the like, the pressure inside the battery pack (10) increases and the bolt (310) is separated from the shaft member (320). Then, when the bolt (310) is separated from the shaft member (320), the upper frame (210) is separated from the bulkhead frame (240) together with the bolt (310).

[0089] Referring to FIG. 7, a flame occurs in the battery cell (110), the pressure inside the pack case (200) increases, the bolt (310) is separated from the shaft member (320), the upper frame (210) is separated from the bulkhead frame (240), and when the upper frame (210) is deformed upward, a buffer space (400) is formed between the upper frame (210) and the battery module (100).

[0090] That is, the upper frame (210) is deformed upward by the flame and gas generated from the battery cell (110), thereby forming a buffer space (400), and as the heat from the flame spreads to other battery modules (100) through the buffer space (400), an overall uniform thermal distribution is achieved, and heat can be prevented from being concentrated in any one battery module (100).

[0091] Figure 8 is a perspective view of a battery pack according to a modified embodiment of the present invention, with only a portion shown.

[0092] Referring to Fig. 8, 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.

[0093] Referring to Fig. 8, a venting portion (250) is formed in the pack case (200). As described above, when the internal pressure of the pack case (200) increases, the bolt (310) is separated from the shaft member (320) and the upper frame (210) is deformed, gas generated from the battery cell (110) can move to the venting portion (250) and be discharged.

[0094] Here, 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.

[0095] 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.

[0096] 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).

[0097] 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 (400), the gas moves along the buffer space (400) to the venting portion (250), and when the venting valve (252) is opened by the pressure of the gas, the gas can be discharged outside the pack case (200).

[0098] That is, the venting is facilitated by the buffer space (400) formed by the deformation of the upper frame (210), so that gas can be easily discharged.

[0099] And, as described above, as the heat spreads to other battery modules (100) through the buffer space (400), concentration of heat in any one battery module (100) is prevented, thereby enabling uniform thermal distribution.

[0100] In addition, since the gas discharge is facilitated by the buffer space (400) 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.

[0101] FIG. 9 is a drawing for explaining a vehicle including a battery pack according to each embodiment of the present invention.

[0102] Referring to FIG. 9, 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.

[0103] 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.

[0104] 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 in an illustrative rather than a restrictive sense. 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.

[0105] 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 the above fastening member is configured to be separated by the internal pressure of the pack case.

2. In paragraph 1, An insertion hole is formed in the above pack case, The above fastening member is, A bolt coupled to one side of the above pack case; and A battery pack characterized by including a shaft member that is inserted into the insertion hole and is coupled to the bolt so as to be detachable from the bolt.

3. In paragraph 2, A battery pack characterized in that the shaft member has screw threads formed thereon and is screw-connected to the insertion hole.

4. In paragraph 2, The above bolt has an inner groove formed, A battery pack characterized in that the shaft member is detachably inserted into the inner groove of the bolt.

5. In paragraph 4, The above shaft member, A first coupling part coupled to the above insertion hole; and A second connecting portion is included that is connected to the inner groove of the bolt, A battery pack characterized in that the first connecting portion is formed with a threaded portion, and the second connecting portion is formed with a non-threaded portion without a threaded portion.

6. In paragraph 5, A battery pack characterized in that the diameter of the first connecting portion is formed larger than the diameter of the second connecting portion.

7. In paragraph 5, A battery pack characterized in that a clearance preventing member is combined with the second connecting portion to prevent clearance with the inner groove.

8. In paragraph 7, A battery pack characterized in that the above-mentioned play prevention part is a rubber bushing.

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 insertion hole is formed in the bulkhead frame, and the shaft member is inserted into and fixed in the insertion hole of the bulkhead frame.

10. In paragraph 9, The above fastening member includes a nut that is coupled to the upper frame, A battery pack characterized in that the bolt is respectively connected to the nut and the shaft member.

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

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

13. In paragraph 9, A battery pack characterized in that when a flame occurs in the battery cell and the pressure inside the pack case increases, the bolt is separated from the shaft member, 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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